SHOP BEST SELLERS
Shop our best selling products
Type: Performance Supplements
Protein Powder
Type: Performance Supplements
Electrolytes - Stick Packs
Type: Performance Supplements
Electrolytes
Type: Performance Supplements
Creatine Monohydrate
Type: Core Supplements
Source Magnesium
Type: Core Supplements
Vitamin D3 & K2
Type: Body Essentials
Raw Elements Shampoo
Type: Body Essentials
Raw Elements Conditioner
Type: Body Essentials
Raw Elements Tallow Soap (Lemongrass)
Type: Performance Supplements
Raw Honey
Type: Body Essentials
Raw Tallow Sun Balm
★★★★★ 1,000+ 5 Star Reviews
Pure ingredients
Raw ingredients. Ancient wisdom. Modern results. Every product contains only what nature intended:
- Grass-fed tallow rich in bioavailable nutrients
- Raw honey and adaptogenic herbs in their purest form
- Regeneratively sourced proteins, never denatured
- Zero synthetic additives or lab-made fillers
Small-batch wellness our ancestors would recognize. Because when you honor nature's integrity, your body knows the difference.
Purely Natural, Perfectly You
Let customers speak for us
I love the way this tallow soap makes my hands feel! Just make sure you shake it before use because it does separate. It smells wonderful, very light scent and the tallow has made my hands feel softer then ever before.
I've been taking now supplements vitamin d and my blood results still show that my Vitamin D levels are low. I saw an ad for this brand and decided to try it. I just had my blood work done again and for the first time ever, my Vitamin D was in the green marker. Very happy!
I literally can't drink water without these electrolytes now. I'm not kidding. You guys killed it with this product. I take both flavors to mix and match sometimes :) I hate the taste of other electrolytes. These taste natural and very light on the flavor, which I love. Please don't ever get rid of this product!!!
This is the only protein powder I have ever taken that digests easily for me. I always struggle with bloat after a protein shake. I tried both but I LOVE THE CHOCOLATE.
Honestly love the taste of this honey. I've been buying the orange blossom for months but the saw palmetto is something else. I definitely recommend it!
Clean, great taste and doesn't leave me bloated. I finally can take protein shakes every day. I tried so many different brands, but every time I drank them I felt like puking. Can't wait to try the chocolate protein
Clean and like the moisture
I love this product. it helps to give me energy.
Trust this product! We’ve been deceived by so many products labeled CLEAN but these guys put their money where their mouth is. Sleeping noticeably better after 2 weeks of consistently taking it!
Taste great and mixes well into a smoothie
It's a bit more liquidity than the usual body wash but overall its nice. Smells good and makes my body soft.
It's a bit thick but its still nice and it smells really good. I feel as though it cleans my scalp well
It's a nice consistency, makes my hair really shiny and moisturized and smells amazing.
Love it
The best protein powder I have ever tried
Why PÜRISHH?
Pure Ingredients
Handpicked and ethically sourced from trusted, natural farms.
Effective Results
Each product is designed to protect, nourish, and enhance your skin’s natural balance.
Holistic Wellness
Embrace a balanced lifestyle with supplements and creams that work in harmony with your body.
Frequently Asked Question
What makes PÜRISHH products different from conventional supplements or skincare?
What makes PÜRISHH products different from conventional supplements or skincare?
Our mission is to return to the raw, unprocessed power of nature. Every product is formulated with 100 % natural ingredients and no synthetic preservatives, fillers, or dyes. For example, the Raw Honey Butter contains whipped Wagyu beef tallow, cold‑pressed olive and coconut oils, mango butter, raw honey and beeswax – it moisturizes deeply and can even replace conventional lotion. The Raw Tallow Sunbalm uses grass‑fed tallow, non‑nano zinc oxide and organic oils to provide mineral sun protection while nourishing the skin. Our Protein Powder combines grass‑fed whey and hydrolyzed collagen with organic superfoods to deliver 26 g of easily digestible protein with zero added sugar. Across their range, Purishh keeps ingredient lists short and transparent, using only what is necessary to support health and well‑being.
Are PÜRISHH’s ingredients ethically and sustainably sourced?
Are PÜRISHH’s ingredients ethically and sustainably sourced?
Yes. The founders emphasize sustainable sourcing and ethical treatment of animals and land. Tallow for the skincare range is hand‑sourced from 100 % grass‑fed, Wagyu, halal cattle in New Zealand, ensuring humane slaughter and optimal nutrient quality. Olive and coconut oils are single‑origin, cold‑pressed. The whey in Purishh protein powder comes from grass‑fed cows raised without hormones or antibiotics, and the collagen is hydrolyzed for better absorption. These practices mean customers receive products that are both pure and sustainable.
Why does PÜRISHH use beef tallow in its skincare products?
Why does PÜRISHH use beef tallow in its skincare products?
Grass‑fed beef tallow is biocompatible with human skin; its fatty‑acid profile closely resembles natural sebum, so it’s absorbed efficiently. Properly rendered tallow is a vitamin powerhouse, naturally supplying vitamins A, D, E, and K that support cell turnover, immune function, and antioxidant protection. Tallow also contains oleic, stearic and palmitic acids that strengthen the skin’s barrier, calm inflammation and maintain moisture. Grass‑fed tallow offers a high concentration of conjugated linoleic acid (CLA), an anti‑inflammatory fatty acid. These nutrients collectively help Purishh’s Raw Honey Butter and Raw Tallow Sunbalm to moisturize, nourish and protect the skin without clogging pores or causing irritation.
How is PÜRISHH protein powder different, and why is it easy to digest?
How is PÜRISHH protein powder different, and why is it easy to digest?
Many conventional protein powders use cheap sources and add artificial thickeners or sweeteners that cause bloating and digestive discomfort. Purishh starts with grass‑fed whey processed via cold‑filtration, which preserves natural enzymes and bioactive peptides that aid digestion. It also adds hydrolyzed bovine collagen to support joints, skin and gut health. The powder uses organic monk fruit for sweetness and contains no carrageenan, gums, sucralose or artificial preservatives, so it mixes smoothly and is gentle on the stomach. Each serving provides 26 g of complete protein with only 1 g of fat and zero sugar, making it suitable for keto, gluten‑free and non‑GMO diets.
What are PÜRISHH Electrolytes, and how do they support hydration?
What are PÜRISHH Electrolytes, and how do they support hydration?
PÜRISHH’s Electrolytes formula offers clean hydration without the artificial colors and preservatives found in many sports drinks. Each serving includes over 800 mg of unrefined Himalayan salt, providing sodium and trace minerals, plus magnesium malate and potassium chloride. Organic fruit powders (raspberry or lemon‑lime) and monk fruit sweetener give a natural flavor without sugar. The formula helps replenish electrolytes lost through exercise, supports muscle function, and is keto‑friendly.
What is Raw Shilajit, and how should it be used?
What is Raw Shilajit, and how should it be used?
Raw Shilajit is a resin harvested from high‑altitude Himalayan rocks. It forms from decomposed plant material and is rich in minerals and fulvic acid. Traditionally used as an adaptogen, Shilajit helps boost energy, improve stamina and support overall health. Purishh provides 100 % pure Himalayan shilajit. Users typically dissolve a pea‑sized amount in warm water, tea or milk. Due to its potent minerals, start with a small dose and consult a healthcare professional if you have existing medical conditions.
What is the Ishh Leaky Gut Protocol?
What is the Ishh Leaky Gut Protocol?
The Ishh Leaky Gut Protocol is a step‑by‑step program designed to help restore gut health naturally. It includes dietary recommendations, lifestyle tips and natural supplements to support the intestinal lining. The protocol focuses on removing irritants, replenishing beneficial bacteria and repairing the gut barrier. It is not a medical treatment, so customers with chronic digestive issues should consult a healthcare professional before starting.
How should I store PÜRISHH products?
How should I store PÜRISHH products?
Store supplements and protein powders in a cool, dry place away from direct sunlight. Skincare products like Raw Honey Butter and Raw Tallow Sunbalm are natural and free from artificial stabilizers; keeping them at room temperature helps maintain texture. If you live in a hot climate, refrigerating tallow‑based balms can prevent melting. Always use clean hands or a spatula to avoid introducing bacteria.
When will my order ship, and how long will delivery take?
When will my order ship, and how long will delivery take?
We ask customers to allow 2–3 business days for processing and production before an order ships. Once dispatched, average transit times are 7–10 business days; however, natural disasters, holidays and weather can cause delays. Free standard shipping is offered on orders over US$150 (or equivalent), and shipping costs for smaller orders are calculated at checkout. PÜRISHH cannot guarantee exact delivery dates because delivery is ultimately the responsibility of the shipping carrier.
Can I subscribe and save on regular purchases?
Can I subscribe and save on regular purchases?
Yes. We offer a subscription program for most of our products. Subscribe and save up to 30 % OFF your first delivery. You can choose delivery intervals (e.g., monthly). Subscriptions auto‑renew, but you may skip or cancel at any time through your account.
Are PÜRISHH products allergen‑free or suitable for special diets?
Are PÜRISHH products allergen‑free or suitable for special diets?
PÜRISHH formulates products without common synthetic additives, but some items may contain potential allergens. The protein powder contains whey (a dairy product) and collagen derived from bovine sources; it is unsuitable for vegans or those with dairy allergies. The Electrolytes formula is gluten‑free, sugar‑free and keto‑friendly. Always review ingredient lists carefully and consult your healthcare provider if you have specific allergies or dietary restrictions.
Where are PÜRISHH products made?
Where are PÜRISHH products made?
PÜRISHH sources ingredients globally, such as New Zealand Wagyu tallow and Himalayan shilajit, but manufactures products in small batches under rigorous quality control. By keeping production small and hands‑on, PÜRISHH can maintain freshness and ensure every batch meets the highest standards.
PÜR Insights
Collagen vs. Whey: Which Protein for Which Goal
Collagen vs. Whey: Which Protein for Which Goal Walk down any supplement aisle and you'll see collagen and whey sitting side by side, both labeled "protein," both promising some version of a stronger, better-looking you. It's easy to assume they're interchangeable. Twenty grams is twenty grams, right? Not quite. Collagen and whey are both proteins in the strict sense, and both count toward the grams on a nutrition label. But they're built from very different amino acids, they behave differently once you swallow them, and they've been studied for very different reasons. Some of the claims attached to each hold up well. Others don't hold up at all. This post goes goal by goal. For each common reason people buy protein (building muscle, holding on to muscle as you age, skin, joints, digestion, simply hitting a daily target) we'll look at what the research says about whey, what it says about collagen, and how strong that evidence really is. A disclosure before we start. Our protein powder is a blend of grass-fed whey concentrate and grass-fed hydrolyzed collagen, and by proportion it's mostly collagen. We don't sell standalone whey or standalone collagen. So we have a stake in both sides of this comparison, and some of what follows doesn't flatter our own product. We'd rather you hear it from us. Why "protein" isn't one thing Protein is made of amino acids. Your body can make some of them itself, but nine of them, the essential amino acids, have to come from food. How useful a protein is depends a lot on how much of each essential amino acid it carries. For muscle specifically, one essential amino acid matters more than the others: leucine. Leucine acts as a signal that switches on muscle protein synthesis, the process your body uses to build and repair muscle tissue. The International Society of Sports Nutrition's position stand on protein and exercise (Jäger and colleagues, Journal of the International Society of Sports Nutrition, 2017, volume 14, article 20) recommends that a serving of protein contain somewhere between 700 and 3,000 milligrams of leucine, alongside a balanced spread of the other essential amino acids. That's the lens for everything below. Whey and collagen differ most sharply in exactly these places: leucine and the full essential amino acid set. What whey is Whey is one of the two main proteins in milk, the other being casein. It's the liquid fraction left over when milk is turned into cheese, filtered and dried into a powder. You'll usually see it sold in three forms: Concentrate keeps a little more of milk's fat and lactose. Isolate is filtered further, so it's higher in protein by weight and lower in lactose. Hydrolysate is partly broken down in advance into smaller pieces. Across all three, whey is a complete protein. It contains all nine essential amino acids, and it's one of the richest common sources of leucine. It also digests quickly, which means amino acid levels in the blood rise soon after you drink it. What collagen is Collagen is the main structural protein in connective tissue. It's what gives skin, tendons, ligaments, and bone their framework. Supplement collagen is usually made from animal hides, bones, or fish skin, then hydrolyzed into small peptides so it dissolves easily and digests well. Collagen has an unusual amino acid makeup. Its structure is built around a repeating pattern in which glycine appears as roughly every third amino acid, and it's also rich in proline and hydroxyproline. Those amino acids are central to collagen's own structure. What collagen lacks matters just as much. It contains essentially no tryptophan, which is one of the nine essential amino acids, and it's relatively low in leucine and several others. That makes it an incomplete protein. This has a formal consequence. Protein quality is often scored with a measure called PDCAAS (protein digestibility corrected amino acid score), which grades a protein by its most limiting essential amino acid. Because collagen is missing tryptophan, its score is zero. Under US food labeling rules, the percent Daily Value for protein, when a label shows one, has to be corrected for protein quality using PDCAAS. So collagen can supply plenty of grams of protein while contributing far less to your essential amino acid needs than those grams suggest. None of this makes collagen useless. It means collagen and whey aren't doing the same job. Goal 1: Building muscle Short answer: whey, clearly. This is the comparison with the most direct evidence, and the results point one way. The cleanest recent head-to-head trial comes from van Loon's lab at Maastricht University. Aussieker and colleagues (Medicine and Science in Sports and Exercise, 2023, volume 55, issue 10, pages 1792 to 1802) ran a randomized, double-blind trial in 45 recreational athletes, 30 men and 15 women, with an average age of 25. After a session of resistance exercise, each person drank 30 grams of whey, 30 grams of collagen, or a non-caloric placebo. The researchers then measured muscle protein synthesis directly, using stable isotope tracers and muscle biopsies over five hours of recovery. The results: Blood amino acids. Whey raised blood levels of leucine and total essential amino acids more than collagen. Collagen raised glycine and proline more. Myofibrillar protein synthesis (the building of contractile muscle tissue, the part that makes muscles bigger and stronger). This was 0.041 percent per hour after whey, 0.036 after collagen, and 0.032 after placebo. Only whey was significantly higher than placebo. So in young, active people, the same 30 grams of protein did measurably more for muscle when it came from whey. This fits with the broader picture of protein and training. A widely cited meta-analysis by Morton and colleagues (British Journal of Sports Medicine, 2018, volume 52, issue 6, pages 376 to 384) pooled 49 randomized trials with 1,863 participants. It found that protein supplementation during resistance training increased gains in muscle mass and strength. The benefit for fat-free mass leveled off at a total daily intake of around 1.6 grams of protein per kilogram of body weight. Those trials mostly used complete, high-quality proteins, which is a big part of why the finding shouldn't be assumed to transfer to collagen. If building muscle is your main goal, total daily protein and consistent training come first. After that, a complete, leucine-rich protein like whey is the better tool per gram. Goal 2: Holding on to muscle as you get older Short answer: whey again, and the gap may matter more here. As people age, muscle tends to respond less strongly to both protein and exercise, a phenomenon often called anabolic resistance. That makes protein quality more important later in life, not less. The most relevant trial was done at McMaster University. Oikawa and colleagues (American Journal of Clinical Nutrition, 2020, volume 111, issue 3, pages 708 to 718) randomized 22 healthy older women, average age about 69, to take 30 grams of either whey or collagen twice a day for six days. During that time each woman also trained one leg with resistance exercise, so the researchers could compare a trained leg with an untrained one in the same person. They measured both the short-term response and the response over several days. The findings: Short term, whey. Whey increased muscle protein synthesis in both the rested leg and the trained leg. Short term, collagen. Collagen raised it only in the trained leg. Over the six days, whey. Whey significantly increased muscle protein synthesis in both conditions. Over the six days, collagen. Collagen did not raise it significantly above baseline. Head to head. Whey outperformed collagen in every condition measured. The authors concluded that whey is the more effective supplement for supporting muscle retention in older women. For context on how much protein older adults may need, the PROT-AGE study group (Bauer and colleagues, Journal of the American Medical Directors Association, 2013, volume 14, issue 8, pages 542 to 559) recommended an average daily intake of 1.0 to 1.2 grams of protein per kilogram of body weight for healthy adults aged 65 and over. They also suggested spreading it across meals in servings of roughly 25 to 30 grams, with about 2.5 to 2.8 grams of leucine each. Collagen on its own struggles to reach that leucine figure. Whey reaches it comfortably. Goal 3: Skin Short answer: the strongest evidence doesn't support collagen here, and whey isn't studied for it. Skin is where collagen marketing is loudest, so it deserves the most careful look. The logic sounds intuitive. Skin is full of collagen, and collagen production declines with age, so eating collagen should help. But collagen you eat doesn't travel intact to your skin. It's digested into amino acids and small peptides first, like any other protein. Whether those fragments meaningfully change your skin is an empirical question, and the answer depends heavily on which studies you count. The most important recent analysis is a 2025 meta-analysis by Myung and Park (American Journal of Medicine, 2025, volume 138, issue 9, pages 1264 to 1277). They pooled 23 randomized controlled trials with 1,474 participants. Taken all together, the trials showed improvements in skin hydration, elasticity, and wrinkles. Then the authors split the trials two ways, by who funded them and by how well they were designed: Trials funded by companies. These showed significant benefits. Trials without company funding. These showed no significant effect on hydration, elasticity, or wrinkles. High-quality trials. No significant effect on any of the three. Low-quality trials. A significant improvement in elasticity only. Their conclusion was that there is currently no clinical evidence supporting collagen supplements to prevent or treat skin aging. It's worth being fair about the limits of that finding. A meta-analysis can only work with the trials that exist, and splitting them into subgroups means each comparison rests on fewer studies. Industry groups have publicly disputed the conclusions. "No good evidence of a benefit" is also not the same as "proven not to work." But if you're buying collagen mainly for your skin, you should know that the effect largely disappears when you look only at the independent and higher-quality research. We've said this plainly elsewhere and we'll keep saying it: we don't think anyone should buy a protein powder, ours included, expecting it to change how their skin ages. Goal 4: Joints, tendons, and connective tissue Short answer: interesting biology, but the evidence is early and the best recent data is underwhelming. This is where collagen has its most plausible rationale. Tendons and ligaments are mostly collagen. Collagen supplements deliver large amounts of glycine and proline, the amino acids collagen is built from. There is early supporting work. Shaw and colleagues (American Journal of Clinical Nutrition, 2017, volume 105, issue 1, pages 136 to 143) gave eight healthy young men either a placebo, 5 grams, or 15 grams of vitamin C-enriched gelatin, a form of collagen. They took it an hour before six minutes of rope skipping. The 15-gram dose doubled a blood marker of collagen production (the amino-terminal propeptide of collagen I) compared with placebo. That's a meaningful signal. But it was eight people, it measured a blood marker rather than tendon strength or injury, and it has not settled the question. The Aussieker trial described above also measured this directly. Alongside muscle-building protein, the researchers tracked synthesis of muscle connective tissue protein, the collagen-rich framework inside muscle. The rates were: 0.072 percent per hour after whey 0.068 after collagen 0.058 after placebo None of those differences were statistically significant. In the authors' words, neither collagen nor whey further increased muscle connective protein synthesis during the early stages of recovery. That doesn't rule out a benefit for tendons specifically, over longer periods, or in particular situations like injury rehab. Those questions are still being studied. But right now it isn't accurate to say that eating collagen has been shown to build stronger joints or tendons. The honest grade is "plausible, under investigation, not established." Goal 5: Digestion and tolerance Short answer: this is personal, and it's a legitimate reason to choose one over the other. Some people simply don't do well with whey. Whey concentrate contains some lactose, and people who are sensitive to lactose may notice bloating or discomfort, especially with larger servings. Isolate contains much less lactose, which is why it's often the better whey choice for those people. Whey is a dairy protein, so anyone avoiding dairy will avoid it entirely. Collagen isn't a dairy product, and hydrolyzed collagen dissolves easily and tends to be well tolerated. For some people, that's the deciding factor. A protein you can drink comfortably every day is worth more than a theoretically superior one that sits in the cupboard. One caution. You'll see collagen marketed for "gut healing." We aren't aware of good human evidence that collagen supplements repair the gut lining, and we're not going to suggest they do. Choosing collagen because it agrees with you is reasonable. Choosing it to treat a digestive condition is a conversation for a clinician. Goal 6: Simply hitting a daily protein number Short answer: both add grams, but they don't count equally. Many people use a protein powder to close the gap between what they eat and a daily target. Here the important point is that collagen grams and whey grams aren't equivalent. If someone's diet is already rich in complete proteins like meat, fish, eggs, and dairy, they're likely getting enough of every essential amino acid from food. Adding collagen on top mostly adds glycine and proline, and it's unlikely to cause any shortfall. Your body pools amino acids from everything you eat across the day, so not every single item needs to be a complete protein. The risk comes when collagen makes up a large share of total protein and the rest of the diet is light. Then you can hit an impressive number on paper while still falling short on leucine and other essential amino acids. This is the scenario the PDCAAS correction on food labels exists to flag. A practical rule: if a powder is doing a lot of the heavy lifting for your daily protein, make sure most of that protein is complete. If your meals already cover the essentials, collagen grams are a reasonable extra. Can you take both? Yes. There's no conflict between them, and many products, including ours, combine them. Combining them makes sense when you want some of the leucine and complete amino acid profile of whey, plus the glycine and proline of collagen, with the tolerance and texture benefits collagen can bring. The trade-off is simple math. The more of a blend that comes from collagen, the less leucine and complete protein you get per scoop compared with the same amount of pure whey. That isn't hidden or mysterious. It follows directly from the amino acid profiles above. Where our blend fits, honestly Since we sell a whey and collagen blend that is mostly collagen, here's how we'd describe it given the research in this post. What it's suited for: Topping up daily protein for people who already eat complete proteins at meals. People who find large servings of whey hard to digest. People who simply want a protein shake they'll actually drink every day. What it isn't: The most efficient possible product for maximizing muscle protein synthesis per scoop. If that's your single priority, a pure whey isolate does that job better gram for gram. A skin treatment. The independent evidence doesn't support that. A proven joint or tendon supplement. That evidence isn't there yet. If you use our blend and muscle is a priority, the practical step is to make sure your meals carry plenty of complete protein too. That way your total leucine intake is covered by the whole day, not by one scoop. Quick reference: which one for which goal Building muscle with training: whey. Supported by direct head-to-head trials in both younger and older adults. Keeping muscle as you age: whey. Older adults may need more leucine per meal, and collagen struggles to supply it. Skin aging: neither has good independent evidence. Collagen's apparent benefit disappears in unfunded and high-quality trials. Joints and tendons: collagen has a plausible mechanism and early supporting data, but it's not established. Dairy or lactose sensitivity: collagen, or whey isolate if you only need to cut lactose. Topping up daily protein when your diet is already protein-rich: either. Collagen is fine as an extra, not as your main source. The honest summary Collagen and whey share a name and a nutrition label line, but they aren't substitutes. Whey is a complete protein, rich in leucine, and it has the clearest evidence for what most people buy protein for: building and keeping muscle. In head-to-head trials it stimulated muscle protein synthesis better than collagen in both young athletes (Aussieker 2023) and older women (Oikawa 2020). Collagen is an incomplete protein with a PDCAAS of zero. It's rich in glycine and proline and easy to digest. Its most popular claim, better skin, doesn't hold up in independent or higher-quality trials according to the largest recent meta-analysis (Myung and Park 2025). Its most plausible claim, connective tissue support, rests on early and mixed evidence. So start with your goal. If it's muscle, choose whey or make sure complete proteins do the main work in your diet. If it's tolerance, convenience, or extra protein on top of an already good diet, collagen or a blend is a reasonable choice. And whatever you buy, be skeptical of any protein that promises to fix your skin. References Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition. 2017;14:20. Aussieker T, Hilkens L, Holwerda AM, Fuchs CJ, Houben LHP, Senden JM, van Dijk JW, Snijders T, van Loon LJC. Collagen protein ingestion during recovery from exercise does not increase muscle connective protein synthesis rates. Medicine and Science in Sports and Exercise. 2023;55(10):1792-1802. doi:10.1249/MSS.0000000000003214 Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine. 2018;52(6):376-384. Oikawa SY, Kamal MJ, Webb EK, McGlory C, Baker SK, Phillips SM. Whey protein but not collagen peptides stimulate acute and longer-term muscle protein synthesis with and without resistance exercise in healthy older women: a randomized controlled trial. American Journal of Clinical Nutrition. 2020;111(3):708-718. doi:10.1093/ajcn/nqz332 Bauer J, Biolo G, Cederholm T, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. Journal of the American Medical Directors Association. 2013;14(8):542-559. Myung SK, Park Y. Effects of collagen supplements on skin aging: a systematic review and meta-analysis of randomized controlled trials. American Journal of Medicine. 2025;138(9):1264-1277. doi:10.1016/j.amjmed.2025.04.034 Shaw G, Lee-Barthel A, Ross ML, Wang B, Baar K. Vitamin C-enriched gelatin supplementation before intermittent activity augments collagen synthesis. American Journal of Clinical Nutrition. 2017;105(1):136-143. US Food and Drug Administration. Food labeling: nutrition labeling of food. 21 CFR 101.9(c)(7). These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Learn more
Creatine vs. Pre-Workout: Different Jobs, Different Timelines
Creatine vs. Pre-Workout: Different Jobs, Different Timelines Creatine and pre-workout are probably the two most common supplements in any gym bag, and they get compared constantly. Which one should I take? Do I need both? Is creatine just a weaker pre-workout? The comparison is understandable, and it's also built on a mistake. These two products aren't competing to do the same job. One is designed to change how you feel and perform in the next hour. The other only works if you take it every day for weeks, and does almost nothing on the day you start. Treating them as alternatives is a bit like comparing a cup of coffee with a training plan. This post breaks down what each one actually does, on what timeline, at what dose, and what the research says about the gap between how pre-workouts are formulated and how their ingredients were studied. One note up front: we sell creatine, and we don't sell a pre-workout. So we have no stake in the pre-workout side of this, and you can weigh what we say about creatine with that in mind. What "pre-workout" actually is "Pre-workout" isn't a single ingredient. It's a product category, and the products in it vary enormously. The best snapshot of what's actually inside them comes from a 2019 study by Jagim, Harty, and Camic, published in Nutrients, volume 11, article 254. They analyzed the supplement facts panels of the top 100 commercially available pre-workout products in the US. The average product contained 18.4 ingredients. Of those, an average of 8.1 were included in a proprietary blend, meaning the label listed them without saying how much of each was in there. Across all 100 products, 44.3 percent of ingredients were in proprietary blends with undisclosed amounts. The most common ingredients, with the share of products containing them and the average amount per serving, were: Beta-alanine, in 87 percent of products, averaging 2.0 grams Caffeine, in 86 percent, averaging 254 milligrams Citrulline, in 71 percent, averaging 4.0 grams Tyrosine, in 63 percent, averaging 348 milligrams Taurine, in 51 percent, averaging 1.3 grams Creatine, in 49 percent, averaging 2.1 grams The researchers concluded that the average amount of beta-alanine per serving was below the recommended effective dose, and that the average caffeine content sat near the low end of the effective range for a 70-kilogram person. One detail matters for reading those averages. They could only be calculated from products that actually disclosed amounts. For the nearly half of ingredients hidden inside proprietary blends, nobody outside the company knows the dose. So the true average for some ingredients is simply unknown. That gives us the right frame for the rest of this post. A pre-workout is usually a dose of caffeine, packaged with a set of other ingredients, some of which work on a completely different timeline from caffeine, and many of which are present at doses below what the research used. Caffeine: the part that works in the next hour If a pre-workout makes you feel and perform differently today, caffeine is almost certainly why. The International Society of Sports Nutrition's position stand on caffeine, published by Guest and colleagues in the Journal of the International Society of Sports Nutrition in 2021, volume 18, article 1, is the most thorough summary of this research. Its key conclusions are worth knowing precisely. Caffeine has been shown to acutely enhance various aspects of exercise performance in many, but not all, studies. Aerobic endurance shows the most consistent moderate-to-large benefits, though the size of the effect differs between individuals. The effective dose range is consistently 3 to 6 milligrams per kilogram of body weight, and the minimal effective dose may be as low as 2 milligrams per kilogram. The most commonly used timing is 60 minutes before exercise. And very high doses, around 9 milligrams per kilogram, are associated with a high incidence of side effects and don't seem to be needed for a performance benefit. Translated into actual numbers, that 3 to 6 milligram per kilogram range works out to roughly: 165 to 330 milligrams for a 55-kilogram person 210 to 420 milligrams for a 70-kilogram person 270 to 540 milligrams for a 90-kilogram person Set against those numbers, the 254-milligram average in the Jagim analysis lands at the lower end for many adults. That's not necessarily a problem. The ISSN position suggests more isn't better past a point, and the extra comes mostly as side effects. The position stand also notes that differences between people, in both performance response and side effects like poor sleep and anxiety, may come down partly to genetic variation in how caffeine is metabolized. We covered this in our post on natural energy without the crash. A single liver enzyme, CYP1A2, handles most caffeine metabolism, and common genetic variants make some people clear caffeine in a few hours while others take much longer. Caffeine's half-life in healthy adults is often cited at around four to five hours, but the reported range is far wider. That has a practical consequence that pre-workout labels rarely mention. If you train in the evening and take a caffeinated pre-workout an hour beforehand, a meaningful amount of that caffeine may still be active when you try to sleep. Since sleep is one of the things that actually supports training recovery, that's a real trade-off, not a minor footnote. Beta-alanine: a slow ingredient in a fast product Beta-alanine is the most common ingredient in pre-workouts, present in 87 percent of the products Jagim analyzed. It's also the clearest example of an ingredient whose research doesn't match how it's sold. The ISSN position stand on beta-alanine, published by Trexler and colleagues in the Journal of the International Society of Sports Nutrition in 2015, volume 12, article 30, explains how it works. On its own, beta-alanine has limited direct performance effects. What it does is raise the level of carnosine in muscle, a compound that helps buffer the acid build-up during hard efforts. The position stand reports that 4 to 6 grams a day can raise muscle carnosine by up to 64 percent after four weeks, and up to 80 percent after ten weeks. Its conclusions on performance are specific: daily supplementation with 4 to 6 grams for at least two to four weeks has been shown to improve exercise performance, with more pronounced effects in efforts lasting one to four minutes. That's the zone of hard, sustained work, like a rowing sprint or a demanding high-rep set, rather than a single heavy lift or a long run. The position stand also notes the benefit appears to reduce neuromuscular fatigue, particularly in older adults, and that more research is needed on strength and on endurance beyond 25 minutes. Now set that next to how it appears in pre-workouts. The research effect depends on taking 4 to 6 grams every day for weeks. The average pre-workout contains 2.0 grams, taken once, before training, often not every day. That's a fraction of the studied dose, on a schedule that doesn't build carnosine the way the research did. There's another detail many people will recognize. The position stand identifies paresthesia, a tingling sensation in the skin, as the main side effect of beta-alanine, and notes it can be reduced by splitting the dose or using a sustained-release form. That pins-and-needles feeling a lot of people associate with their pre-workout "kicking in" is this side effect. It isn't the performance benefit, which comes from carnosine building up over weeks, not from anything you feel in the 20 minutes after a scoop. Creatine: the part that only works if you're consistent Creatine works on a completely different principle from caffeine, and that's the heart of why comparing the two is a category error. Your muscles store creatine as phosphocreatine, which they use to rapidly regenerate energy during short, intense efforts. Supplementing raises those stores toward a saturation point. That's it. It doesn't do anything acute in the hour after you take it. Its benefit depends on your muscles already being topped up when you train. The International Society of Sports Nutrition's 2017 position stand by Kreider and colleagues describes two ways to get there. You can load, at about 0.3 grams per kilogram of body weight per day for five to seven days, then drop to a maintenance dose. Or you can simply take 3 to 5 grams a day and reach the same saturation more gradually, in roughly three to four weeks. Either route ends in the same place. Loading is a speed choice, not an effectiveness one. What it does once you're saturated is well studied. In older adults, a three-level meta-analysis found that adding creatine to resistance training significantly improved muscle strength compared with training alone, with an effect size of 0.31 and a 95 percent confidence interval of 0.18 to 0.45, rated moderate certainty. We've covered the creatine research in detail elsewhere, including the places where the evidence is weaker than the marketing. Here's where pre-workouts and creatine collide. Creatine appeared in 49 percent of the products in the Jagim analysis, averaging 2.1 grams per serving. That's below the standard 3 to 5 grams. And because people tend to take pre-workout only on training days, creatine delivered that way may not be taken often enough to reach and hold saturation, which is the only way it works. So if your pre-workout lists creatine, it's worth checking whether the amount is disclosed, whether it reaches 3 grams, and whether you're taking it daily. If not, the creatine on the label probably isn't doing what you think. The two timelines side by side Putting the three main ingredients together makes the difference concrete. Caffeine acts within about an hour, is dosed around 3 to 6 milligrams per kilogram, and its effect wears off over the following hours. You feel it, and it works on the day you take it. Beta-alanine needs 4 to 6 grams a day for at least two to four weeks before performance effects appear, and its benefits are concentrated in efforts lasting one to four minutes. The tingle you feel is a side effect, not the benefit. Creatine needs about a week of loading or three to four weeks at 3 to 5 grams a day to saturate your muscles, then works as long as you keep taking it. You mostly don't feel it at all. One of these is a same-day performance aid. The other two are training adaptations that build over weeks. A typical pre-workout bundles all three into one scoop, timed for the first, and usually dosed below the research for the other two. Can you take both? Yes, and plenty of people do. The question that usually comes up is whether caffeine cancels out creatine. We covered this in our post on creatine timing and dosing. The concern traces back mainly to a small 1996 study by Vandenberghe and colleagues that used an unusually high caffeine dose alongside an aggressive creatine loading protocol. A 2022 systematic review by Elosegui and colleagues in the International Journal of Sport Nutrition and Exercise Metabolism found no consistent interaction between creatine and caffeine on performance. So taking a normal caffeine dose before training, and taking creatine every day, isn't a conflict according to the current evidence. They're doing different jobs on different schedules. The proprietary blend problem The biggest practical issue with pre-workouts isn't any single ingredient. It's that you often can't tell what you're taking. When 44.3 percent of ingredients across the top 100 products are hidden inside proprietary blends, you can't compare a product to the research. Beta-alanine needs 4 to 6 grams a day. Creatine needs 3 to 5. Caffeine works at 3 to 6 milligrams per kilogram. If a label lists "performance matrix, 6 grams" containing all three, there's no way to know whether any of them reach a studied dose. That also matters for caffeine specifically. If you're sensitive to it, or combining a pre-workout with coffee or other caffeinated products during the day, knowing the exact amount isn't a detail. It's how you avoid ending up near the high-dose range the ISSN associates with side effects. As a rule, a product that discloses the amount of every ingredient is easier to evaluate than one that doesn't, whatever the marketing on the front of the tub says. Which one makes sense for you Since they do different things, the useful question isn't which one is better. It's what you're actually trying to get. If you want a same-day boost in energy, alertness, and endurance, caffeine is the ingredient with the evidence. You don't necessarily need a multi-ingredient product to get it, as long as you know your dose and keep it well clear of bedtime. If you do use a pre-workout, pick one that tells you exactly how much caffeine is in each serving. If you want a long-term improvement in strength and high-intensity training capacity, creatine monohydrate is the better-supported option. Take 3 to 5 grams every day, including rest days, and give it three to four weeks. Timing around your workout doesn't matter much. If your training involves a lot of hard efforts lasting one to four minutes, beta-alanine has reasonable evidence, but only at 4 to 6 grams a day for weeks, ideally split into smaller doses to limit tingling. A single pre-workout scoop usually won't get you there. And if you train in the evening, think twice about caffeine late in the day. Protecting your sleep probably matters more to your progress than a slightly better session. The honest summary Creatine and pre-workout aren't alternatives. A pre-workout is mainly a vehicle for caffeine, which the ISSN finds improves performance at 3 to 6 milligrams per kilogram taken about an hour before exercise, with aerobic endurance showing the most consistent benefit and very high doses adding side effects rather than performance. Creatine is a slow, cumulative supplement that only works once your muscles are saturated, which takes about a week of loading or three to four weeks at 3 to 5 grams a day. The awkward part is what's in between. In an analysis of the top 100 US pre-workouts, the average beta-alanine dose was below the effective amount, creatine averaged 2.1 grams against a studied 3 to 5, and 44.3 percent of all ingredients were hidden in proprietary blends. Two of the most common ingredients only work with daily use over weeks, yet they're sold in a product designed to be taken once before training. If you want a same-day effect, know your caffeine dose. If you want a long-term one, take creatine daily and be patient. And whatever you buy, a label that tells you exactly how much of each ingredient is inside is worth more than any blend name on the front.
Learn more
A Realistic Starting Point for Women Over 40
A Realistic Starting Point for Women Over 40 Over the past month we've written a dozen posts about women's health after 40: creatine, protein, muscle, bone, brain fog, hydration, skin, and the "hormone balancing" aisle. Each one dug into a single question and followed the research wherever it went, including the places where it went against what supplement companies, us included, might prefer to say. This post pulls it together into something more useful than a reading list: an order of operations. If you're in your 40s and want to do something sensible for how the next few decades go, where do you actually start? The honest answer is shorter than most people expect. A few things have strong evidence and matter a great deal. One supplement has a reasonable case. Quite a lot of what's marketed to women in this decade can be safely skipped. And some questions aren't supplement questions at all. What's actually changing in this decade It helps to know what you're responding to. Muscle and strength. The European Working Group on Sarcopenia in Older People, in its 2019 consensus published in Age and Ageing, describes muscle mass and strength peaking up to around age 40, holding through midlife, then declining. Beyond age 50, it cites losses of 1 to 2 percent per year in leg muscle mass and 1.5 to 5 percent per year in strength. Strength falls faster than size, which is why that group made strength, not mass, its primary diagnostic criterion. Hormones. Menopause arrives at an average age of 51, with perimenopause typically beginning in the mid-to-late 40s, though timing varies widely. For women, the documented acceleration in muscle loss and the reduced response to training and protein appear mainly around and after menopause. Research specifically reports no significant sex difference in how middle-aged adults respond to training and nutrition. So the 40s are less a cliff than the beginning of a slope. Bone, skin, sleep, and thinking. Bone loss and skin collagen loss both speed up as estrogen falls. Sleep often gets more disrupted. And many women notice changes in memory and focus, which the SWAN study, one of the largest long-term studies of midlife women, found to be real but modest and, so far, apparently temporary. What changes less than you've been told. Two things came up repeatedly in our research. Hormonal shifts change some of the body's set points for fluid balance, but a 2022 review of the menstrual cycle research found no consistent effect on fluid retention, sweat rates, or electrolyte losses. And "hormone balance" isn't a measurable state at all, because healthy hormones are supposed to fluctuate. With that in mind, here's the order we'd suggest. Step 1: Start strength training, and keep it simple If you do one thing from this post, make it this. Across every topic we looked at this month, resistance training kept showing up as the intervention with the strongest evidence. The World Health Organization's 2020 guidelines, published by Bull and colleagues in the British Journal of Sports Medicine, recommend muscle-strengthening activity at moderate or greater intensity, involving all major muscle groups, on two or more days a week. For older adults, they add varied activity emphasizing balance and strength training on three or more days a week to help prevent falls. The WHO describes moderate intensity, relative to your own capacity, as usually a 5 or more out of 10. Two details make this more achievable than it sounds. First, the WHO review found no evidence that higher volumes of muscle-strengthening activity add further health benefit, so you don't need to live in a gym. Second, in research on older adults, training does most of the work. A network meta-analysis of 38 randomized trials found that adding protein supplements to a resistance training program produced no difference on any outcome compared with the training program alone. In practice, that means two or three sessions a week covering legs, hips, back, chest, core, shoulders, and arms, with the effort or weight increasing gradually over time. If you're new to this, a qualified coach for the first few sessions is a good investment. And track strength, not just the scale. Because strength declines faster than muscle size, measures like grip strength and how easily you can rise from a chair without using your arms tell you more about what matters than body weight does. For the detail, see our posts on muscle loss in midlife and on strength training after 40. Step 2: Get enough protein, spread across your meals Protein is the one nutritional input with a direct, well-established role in maintaining muscle, so it comes next. The official recommended dietary allowance is 0.8 grams per kilogram of body weight per day. Several lines of research suggest that's a floor rather than an ideal. Studies using a method called indicator amino acid oxidation estimated requirements closer to 1.2 grams per kilogram, without finding differences by sex or age. Expert groups go further for older adults: the PROT-AGE Study Group recommends 1.0 to 1.2 grams per kilogram, and the ESPEN Expert Group 1.0 to 1.5 grams per kilogram. It's worth being precise that those two recommendations were written for people over 65. In your 40s, the case is about building good habits before the harder years arrive, not a sudden jump in what you need. How you spread it matters too. PROT-AGE describes a per-meal threshold for older adults of roughly 25 to 30 grams of protein containing about 2.5 to 2.8 grams of leucine. A lot of people get most of their protein at dinner and very little at breakfast. Moving some of it earlier is one of the easiest changes available, and it doesn't require eating more overall. One honest note on protein powders, including ours. If you're using a powder to hit that per-meal threshold, a whey-dominant protein does it more efficiently than a collagen-dominant one, because whey is much richer in leucine. Our blend leans toward collagen, so it isn't the most efficient tool for that particular job. For the full picture, see our post on protein after 40. Step 3: Treat sleep as part of the plan Sleep didn't get its own post this month, but it kept surfacing in almost every topic. In SWAN, the study behind our brain fog post, the researchers point to sleep and mood as factors that worsen during the menopause transition and that affect memory and focus. Their guidance links lack of sleep directly to poor memory and difficulty concentrating. In our magnesium research, sleep was the one area where the case for magnesium held up reasonably well, and it wasn't actually a hormonal effect, but a general one in a group of people who often sleep badly. If night sweats are waking you, the mechanism suggests a practical step. Robert Freedman's research found that in women with hot flashes, the body's temperature buffer between sweating and shivering narrows to almost nothing, so small rises in core temperature trigger a flush. Keeping your bedroom cool targets that directly, and his review notes that cooling the body reduces hot flashes. If your sleep is badly disrupted, that's worth raising with a clinician. Better sleep may do more for your energy and focus than anything on this list. For more, see our posts on brain fog in midlife, magnesium and hormonal change, and hydration and hormonal shifts. Step 4: Wear a tested sunscreen every day For skin, the strongest evidence we found had nothing to do with nutrition. The Nambour trial, published by Hughes and colleagues in the Annals of Internal Medicine in 2013, randomly assigned 903 adults under 55 to daily or occasional use of a broad-spectrum sunscreen and followed them for four and a half years. The daily group showed no detectable increase in skin aging, and 24 percent less skin aging than the occasional-use group. The same trial tested a beta-carotene supplement and found no overall effect. Use a broad-spectrum sunscreen with an SPF rating and a Drug Facts label. Our Sun Balm is not one, and we've said so before. A moisturizer, including our tallow products, helps with dryness and the feel of the skin's surface, but it doesn't protect against UV or rebuild collagen. For the detail, see our post on skin changes in your 40s. Step 5: If you want one supplement, creatine has the clearest case Once the first four steps are in place, creatine monohydrate is the supplement with the most consistent evidence for women in this decade, as long as you're training. The evidence is led by strength. A 2021 review by Smith-Ryan and colleagues in Nutrients concluded that creatine appears effective for strength and exercise performance in pre-menopausal women, and found that post-menopausal women may benefit in muscle size and function at higher doses. A three-level meta-analysis in older adults found a significant strength benefit when creatine was added to resistance training, with an effect size of 0.31 and a 95 percent confidence interval of 0.18 to 0.45, though no significant effect on muscle mass. That's a modest, real benefit, not a transformation. The standard dose is 3 to 5 grams a day of creatine monohydrate. Loading isn't necessary. Without it, your muscles reach full saturation in about three to four weeks. Timing doesn't matter much; consistency does. The common fears mostly don't hold up. A 2023 randomized trial found no significant increase in body weight in women across any phase of the menstrual cycle. A 2025 randomized trial found no effect on hair or on the hormone DHT, though it was in young men. And reviews spanning more than a decade have found no increase in dehydration or cramping. The real caveats: there are no human trials of creatine supplementation during pregnancy, data on perimenopausal women specifically is still limited, and anyone with kidney disease should talk to a doctor first. If you have blood tests, tell your doctor you take creatine, because it raises a kidney marker called creatinine without indicating kidney damage. We sell creatine monohydrate. For all the detail, see our posts on creatine for women, creatine dosing, and creatine myths. What you can probably skip This is the list that saves money, and it's built on the same research. Vitamin D for fracture prevention, if you're not deficient. The VITAL trial, published by LeBoff and colleagues in the New England Journal of Medicine in 2022, gave 25,871 adults vitamin D3 or a placebo and found no reduction in fractures, even in people with lower vitamin D levels at the start. In 2024, the US Preventive Services Task Force issued a draft recommendation against vitamin D supplementation for preventing fractures and falls in adults living in the community, and the Endocrine Society advised against routine supplementation in healthy adults under 75. Correcting a genuine deficiency is still worthwhile, and some groups, such as adults over 75, are still advised to supplement. We sell a vitamin D3 and K2 product, and this evidence complicates the case for it. Collagen supplements for skin aging. A 2025 meta-analysis of 23 trials by Myung and Park in the American Journal of Medicine found benefits when all trials were pooled, but no effect in the high-quality trials or in trials not funded by industry. Industry disputes that interpretation. Our protein blend is mostly collagen, and we wouldn't recommend buying it as a wrinkle treatment. "Hormone balancing" blends and "adrenal support." A 2016 systematic review of 58 studies by Cadegiani and Kater concluded there is no substantiation that "adrenal fatigue" is a real medical condition. Cochrane reviews found no conclusive benefit from phytoestrogens for hot flushes, apart from a narrow signal for high-dose genistein, and evidence on black cohosh that is best described as conflicting. Brain fog supplements. The largest trial of ginkgo, involving more than 3,000 older adults, found no effect on dementia or cognitive decline. The European Food Safety Authority concluded in 2024 that a link between creatine and better cognition hasn't been established. Standalone BCAAs, if your protein is adequate. A 2017 review by Robert Wolfe concluded that the claim that BCAAs alone stimulate muscle building is unwarranted, because muscle needs all the essential amino acids, which complete protein already provides. High-dose vitamin C and E around your workouts. In a 2016 randomized trial by Bjørnsen and colleagues, older men taking them alongside strength training gained less muscle than those on placebo. Other studies found smaller or no effects, but there's no good evidence they help training. Electrolytes "for your hormones." Electrolytes are genuinely useful for heavy sweating, long efforts in the heat, and very low-carb diets. The research doesn't support taking them because of hormonal changes alone. We sell an electrolyte product, and those first reasons are the honest ones. When it isn't a supplement question Some situations need a doctor rather than a product, and recognizing them is part of a realistic plan. See a doctor if memory changes come on suddenly. SWAN's guidance specifically flags this. Gradual, on-and-off word-finding trouble in your late 40s fits the research pattern. Sudden change doesn't. Get persistent fatigue, weight changes, mood changes, or changes in your cycle checked. These overlap with conditions, such as thyroid disorders, that standard blood tests can identify. If you've been diagnosed with osteoporosis or osteopenia, kidney disease, or another condition, work with your clinician rather than substituting nutrition for treatment. If you're pregnant or trying to become pregnant, check supplements with your obstetric provider first. And questions about hormone therapy belong in a conversation with a clinician, who can weigh the options against your own health history. What "realistic" means The word is in the title for a reason. None of the steps above will make you feel like a different person in a fortnight. Strength builds over months of consistent training. Creatine takes about three to four weeks to saturate your muscles at a standard dose, and its effect is modest. Sleep and sun protection pay off over years rather than days. What these steps have in common is that each is backed by evidence you can look up, and together they address the changes that actually define this decade: strength, muscle, bone, skin, sleep, and focus. That's a smaller, less exciting list than the supplement aisle offers. It's also one that holds up. The honest summary For women over 40, the realistic starting point is short. Strength train two or more days a week, covering all the major muscle groups, as the WHO recommends, and track your strength. Eat enough protein and spread it across your meals, including breakfast. Protect your sleep, and keep your bedroom cool if hot flashes are disrupting it. Wear a tested broad-spectrum sunscreen every day. If you want one supplement on top of that, creatine monohydrate at 3 to 5 grams a day has the clearest case, as long as you're training. Beyond that, a lot can be skipped: vitamin D for fracture prevention if you're not deficient, collagen for wrinkles, hormone-balancing blends, adrenal support, brain fog supplements, standalone BCAAs, and high-dose antioxidants around your workouts. Some of those are products we sell, and we've said so in each post. And some things aren't supplement questions at all. Sudden memory changes, persistent unexplained symptoms, diagnosed conditions, pregnancy, and hormone therapy all belong with a clinician. That's the whole plan. It fits on one page, and every part of it comes with a study you can check.
Learn more