The Rebrand

A gym supplement walks into the beauty aisle

For thirty years creatine was the least glamorous product in the store. A white powder in a plastic tub, sold to men who wanted a heavier bench press, priced like flour because it essentially is flour-cheap to make. It worked. Everyone knew it worked. Nobody made a lifestyle out of it.

Then it moved shelves. GNC reported that women now account for roughly 30% of creatine purchases, up from 18% in 2020, with the chain's creatine sales up about 75% over the same period.16 Trade data put creatine at +71.9% in multi-outlet retail for the 52 weeks ending November 2025, on top of a 46.5% gain the year before.16 Somewhere in that migration, the pitch changed. Creatine stopped being about lifting things and started being about glowing.

You can watch it happen on the product pages. Free Soul's CreaGlow is a creatine-and-collagen powder filed under the site's "Beauty & Skin" category, sold with the line "where radiance meets resilience" and a stat bar advertising 85% who saw stronger nails and 82% who report shinier hair.17 Clean Program's Creatine + Collagen, formulated under a physician's name, leads with "Promotes healthy skin, hair, nails, & connective tissue."18

A reader review on the CreaGlow page reads: "Had no idea creatine did anything for skin before I came across this." Another: "Been on it for about six weeks and my skin has responded in ways that a £50 serum never managed."17 The inference has landed exactly where it was aimed.

So let's ask the only question that matters. Has anyone, anywhere, ever swallowed creatine in a controlled trial and measured what happened to skin?

No. Not once. Not a wrinkle, not an elasticity reading, not a hydration measurement. The entire category is being sold on a study that does not exist.

PubMed and ClinicalTrials.gov, searched August 2026
The Real File

What creatine actually has, which is a lot

I want to be precise about this, because the trick being played depends on creatine's real evidence being excellent. It is.

The International Society of Sports Nutrition position stand remains the anchor document: creatine monohydrate is the most effective ergogenic compound available for high-intensity work, with a safety record covering doses up to 30 g per day for five years across populations from infants to the elderly.1 That is not a supplement-industry flourish. It is one of the better-characterised small molecules in human nutrition.

Meta-analysis · 22 RCTs · n=721 Chilibeck et al. — Open Access J Sports Med, 2017

Design. Twenty-two randomized trials of creatine plus resistance training versus resistance training alone in older adults, 7 to 52 weeks.2

Results: Lean tissue mass increased by a mean difference of 1.37 kg (95% CI 0.97 to 1.76) over training alone. Chest press strength SMD 0.35, leg press SMD 0.24. Authors reported no conflicts of interest.

Limitation: A newer 2025 meta-analysis of 8 higher-quality trials found smaller, borderline effects — lean mass SMD 0.27 (0.02 to 0.53).4 The effect is real and it is also shrinking as the trials improve.

That 1.37 kg is the honest number for older adults who train. It is not a transformation. It is, however, more than nearly anything else on the supplement shelf can demonstrate, and in the context of age-related muscle loss it matters.

Cognition is the newer and more contested front. A 2024 meta-analysis of 16 trials and 492 participants found a memory benefit of SMD 0.31, graded moderate certainty, with processing speed and attention significant but graded low, and no effect on overall cognition or executive function.5 A separate memory meta-analysis drew a formal letter to the editor alleging double-counting that produced false positives.6 And the largest single trial — preregistered, double-blind, crossover, 123 participants on 5 g daily for six weeks — found backward digit span only bordering significance at p=0.064 and everything else null.7

The viral cognition result, the one that circulates as proof that creatine sharpens the brain, is a single high dose of 0.35 g/kg given during 21 hours of sleep deprivation, with real phosphorus MRS confirming the brain's energy state changed.8 Good study. It says something about acute sleep deprivation. It says nothing about your Tuesday.

As for women specifically: the reference review notes that females carry roughly 70 to 80% lower endogenous creatine stores than males, which is a genuinely interesting reason to think supplementation might matter more for them.9 Post-menopausal muscle benefit in that literature required 0.3 g/kg/day — around six times the standard 5 g scoop. The review contains no skin content whatsoever.

The Skin File

Four studies, one employer

Every "creatine is good for skin" claim in circulation traces back to a small cluster of papers. I read all of them. Three are in-house work from Beiersdorf AG — the company that makes Nivea — and the fourth is a conference poster.

Every one of them is about creatine applied to the skin. None involves swallowing it.

In vitro + topical Lenz et al. — J Invest Dermatol, 2005

Design. Established that human skin expresses creatine kinase isoenzymes and a creatine transporter, and that keratinocytes given exogenous creatine resist oxidative and UV stress better in culture.10

Results: The mechanistic foundation for the whole field, and legitimate cell biology. Four co-authors were Beiersdorf employees.

Limitation: This is a story about cells in a dish and creatine placed on skin. It establishes that skin can use creatine, not that eating creatine delivers any.

Uncontrolled · n=36 women Fischer et al. — J Cosmet Dermatol, 2011

Design. Thirty-six women aged 35 to 55, cream applied twice daily to the forearm for 2 and 5 weeks. The test product was Nivea Visage DNAge, Beiersdorf's own retail cream, containing both folic acid and creatine. Corresponding author: Beiersdorf AG, Department of Skin Biology.11

Results: A viscoelasticity index rose to 107.5% of baseline at 2 weeks and 106.9% at 5 weeks (p=0.0002). In other words, roughly a 7% change in a firmness reading on the inner forearm.

Limitation: The comparison site was untreated skin. No vehicle control, no placebo cream, and no blinding described anywhere in the paper. Creatine cannot be separated from the folic acid or from the moisturiser base carrying both.

Baseline-controlled · n=43 men Peirano et al. — J Cosmet Dermatol, 2011

Design. Forty-three men, single centre, six weeks of facial application. Every author was Beiersdorf AG Research and Development. The formulation was creatine plus guarana extract plus glycerol — a stimulant and a humectant along for the ride.12

Results: Reduced jowl sagging "as compared to baseline." The wrinkle finding came from investigator visual scoring. Dermal penetration was demonstrated in ex vivo pig skin.

Limitation: Improvement measured against a participant's own starting point is not evidence of drug effect. Six weeks of twice-daily moisturiser improves most faces on most scales, which is why vehicle controls exist.

The fourth item is the one I find most telling. A 2005 entry titled "Topical application of creatine is multibeneficial for human skin" is cited on product pages and in trade articles as though it were a study. It is page P32 of a meeting-abstract supplement in the Journal of the American Academy of Dermatology.13 It is not indexed in PubMed. It was never published as a full peer-reviewed paper. It is a poster, and it has been laundered into a citation.

Add it up. Total human participants across the entire topical creatine literature: 79. Zero vehicle-controlled. Zero described as blinded. Two used multi-ingredient formulas. One measured against baseline. All of them belong to a cosmetics manufacturer testing its own products.

Creatine and Skin by the Numbers
0
Trials of oral creatine with any skin outcome, in PubMed or ClinicalTrials.gov
43
Men in the largest creatine face-cream study — run by Nivea's maker, measured against baseline
9×
Price premium of creatine-collagen beauty powders over plain monohydrate

Searched August 2026. The one registered study on earth touching creatine and skin health is an uncontrolled, single-arm adherence study run by the supplement's own manufacturer, with skin listed as an exploratory outcome.19

The Delivery Problem

The mechanism runs backwards

Here is the part that should end the conversation, and rarely gets raised.

Every piece of supporting evidence for creatine and skin involves putting creatine on the skin. That delivery route exists precisely because it bypasses the problem that oral dosing has: getting a molecule to a specific tissue.

Skeletal muscle holds roughly 95% of the body's creatine pool.1 Uptake runs through the SLC6A8 transporter, which skin does express.10 But expressing a transporter is not the same as receiving meaningful flux, and we have a well-studied comparison case.

The brain is the best-characterised non-muscle tissue for creatine uptake, and the numbers are humbling. Twenty grams a day — four times the standard scoop — for four straight weeks raised total brain creatine by 8.7%, ranging from 3.5% in some regions to 13.3% in others.14 Grey matter moved 4.7%. That is a month of aggressive dosing to shift a tissue by single digits.

Skin has never been measured at all. Not once. The basic pharmacokinetic question — does oral creatine change the creatine content of your dermis — has no published answer in either direction.

So the argument on the tub requires you to believe that a 5 g scoop meaningfully changes fibroblast phosphocreatine, when the closest analogous tissue needs 20 g a day for a month to move under 9%, and when the only human data supporting any skin effect came from rubbing the compound directly onto the target organ.

The evidence is topical. The product is oral. Nobody has built the bridge, and the tissue-uptake data suggest the bridge is short on materials.

Dr. Maren Cole
The Hair Paradox

The internet believes both things at once

There is a beautiful symmetry in the creatine discourse that I do not think anyone has enjoyed enough. The beauty market now sells creatine as something that makes hair shinier and stronger. The gym forums have insisted for fifteen years that creatine makes you go bald. Both camps are working from roughly the same amount of evidence, which is to say almost none.

The growth claim has nothing behind it. No trial, no mechanism, no registered study. It appears on labels because "hair, skin and nails" is a phrase, not a finding.

The baldness claim at least has an origin. In 2009, a double-blind crossover in 20 college rugby players found that a week of loading raised dihydrotestosterone by 56%, still 40% above baseline at three weeks, with the DHT-to-testosterone ratio up 36%.15 Real result, real statistics. The paper never measured hair. It has never been replicated. It became an internet certainty anyway.

The trial designed to settle it — Texas Tech, creatine versus androgens versus global hair assessments — was withdrawn with zero participants enrolled.19 Fifteen years of argument sat on top of that hole.

RCT · 12 weeks · n=45 Lak et al. — J Int Soc Sports Nutr, 2025

Design. Forty-five resistance-trained men randomized to 5 g/day creatine monohydrate or maltodextrin for 12 weeks; 38 completed. Hair assessed by trichogram and FotoFinder — density, follicular unit count, cumulative thickness. The first study ever to actually look at follicles.20

Results: No group-by-time interaction for any hormone or hair outcome. Not DHT, not the DHT:T ratio, not hair growth. All p>0.05.

Limitation: Substantial disclosed industry ties among the authors, including advisory roles with creatine brands and the society that publishes the journal. The conflicts point toward the null result they found, so read it with that in mind — but it is still the only follicle data that exists.

My reading: creatine almost certainly does not cause hair loss, and it certainly does not grow hair. One of those two conclusions has a trial behind it. The other has a marketing department.

What's In the Tub

Read the ingredient panel, not the product name

Now go back to those beauty blends and read the ingredient-level copy rather than the headline.

On the CreaGlow page, the collagen block says the marine collagen "delivers visibly firmer, smoother skin." The creatine block says it "supports muscle strength, endurance and recovery."17 On Clean Program's page, the skin, hair and nail language sits with the bovine collagen peptides; creatine's own bullet lists energy, maintenance, cognition and endurance.18

The skin claims are attached to the collagen. They are legally and scientifically the collagen's claims. The product name, the shelf category and the photography do the rest of the work, and the customer walks away believing creatine did something for her face.

This is not an accident of copywriting. Under EU and GB regulation, the only authorised health claim for creatine is that it increases physical performance in successive bursts of short-term, high-intensity exercise.21 There is no authorised creatine claim for skin, hair, nails or appearance. So the skin language goes where a claim is permitted, and adjacency does the rest.

Then there is the arithmetic. Plain creatine monohydrate runs about $0.15 per 5 g serving in bulk, and roughly $0.17 for the supermarket house brand. The beauty blends run $1.40 per serving and up.17,18,22 You can buy both ingredients separately, at clinical doses, for a fraction of the bundle.

Two more things worth knowing before you buy. When NOW Foods ran HPLC on 12 creatine gummy brands, six of twelve failed label claim — a 46% failure rate — with several products loaded mostly with creatinine, the inert degradation product that forms when creatine sits in water and heat, which is what a gummy is.23 More alarming, the company reported that none of the third-party laboratories it normally uses could test the gummy format at all. And creatine HCl, the premium form, was put head to head against monohydrate in a 40-person, eight-week trial and showed no benefit whatsoever over the cheap version.24

The collagen is doing the talking

On both leading beauty blends, "firmer skin," "shinier hair" and "stronger nails" appear in the collagen ingredient block. Creatine's block says strength, energy and focus. If you want the skin ingredient, you can buy it alone.

Nearly half of gummies failed testing

Six of twelve brands came in below label claim in HPLC testing, several containing mostly creatinine rather than creatine. Buy powder. Water and heat degrade creatine, and a gummy is both.

You may be paying nine times over

About $1.40 per serving for a beauty blend versus $0.15 for plain monohydrate. Creatine HCl carries a premium too, and lost a head-to-head trial against monohydrate on every outcome.

Mention it before a kidney test

Creatine raises serum creatinine, which can make a routine eGFR look worse than your kidneys are. This is a lab artefact, not damage — but only if the lab knows. Expect roughly a kilogram of intracellular water in month one.

On safety more broadly: the kidney myth persists because of that creatinine artefact, and controlled work continues to find the marker rising without renal pathology.25 But side effects are not zero. In the largest blinded cognition trial, participants reported adverse effects more than four times as often on creatine as on placebo.7 That is worth knowing about a compound increasingly marketed as consequence-free.

The Verdict

Borrowed evidence, wrong organ

Dr. Cole's Verdict

I want to split this rating cleanly, because the two halves point in opposite directions and the gap between them is the entire story.

For muscle, strength and lean mass in older adults, creatine would earn Strong Evidence in this newsletter without hesitation. Twenty-two trials, 721 participants, a defensible 1.37 kg. For cognition, I would call it Promising — moderate certainty for memory, contested statistics, a largest-trial that came back mostly null. Both of those are honest, useful conclusions, and if you take creatine for either reason you are on solid ground.

For the skin and beauty claim, the rating is Marketing Hype, and I chose that over Insufficient Data deliberately. "Insufficient Data" describes a plausible claim nobody has gotten around to testing. This is different. The claim is being actively marketed while the supporting evidence runs the wrong direction — all of it topical, which is the delivery route that exists specifically to solve the problem oral dosing has. The tissue-uptake analogue predicts single-digit change at best. The four human studies belong to a cosmetics company testing its own creams against untreated skin. And the skin claims printed on the tub are attached, in the ingredient panel, to the collagen.

What has happened here is that a genuinely excellent evidence base was borrowed from one organ and stapled to another. That is not a data gap. That is a transfer, and the burden sits entirely with the people making it.

If you want creatine, take creatine. Five grams a day of plain monohydrate, the cheapest tub you can find, for muscle and possibly for memory. If you want the skin ingredient, buy the collagen — which has its own literature and its own limitations, and which we have covered separately. Buying them fused together at nine times the price, on the strength of a claim nobody has tested, is the part I would skip.

The Bottom Line
Marketing Hype

Creatine has one of the best evidence bases in sports nutrition — 721 participants for muscle, and exactly zero human trials of oral creatine measuring anything about skin. The four studies behind the beauty claim were run by Nivea's manufacturer, applied to the skin rather than swallowed, against untreated forearms.

Sources
  1. 1. Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18. PMID 28615996. Several authors report supplement-industry affiliations.
  2. 2. Chilibeck PD, Kaviani M, Candow DG, Zello GA. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access J Sports Med. 2017;8:213-226. PMID 29138605. 22 RCTs, n=721, 7–52 weeks.
  3. 3. Devries MC, Phillips SM. Creatine supplementation during resistance training in older adults: a meta-analysis. Med Sci Sports Exerc. 2014;46(6):1194-1203. PMID 24576864. n=357, mean 12.6 weeks.
  4. 4. Liu S, Huang N, Wu W, et al. Effects of creatine supplementation combined with resistance training on strength and lean mass in the aged: systematic review and meta-analysis. Eur Rev Aging Phys Act. 2025;22(1):26. 8 RCTs, n=482. Lean mass SMD 0.27 (0.02–0.53).
  5. 5. Xu C, Bi S, Zhang W, Luo L. The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis. Front Nutr. 2024;11:1424972. PMID 39070254; corrigendum 2025. 16 RCTs, n=492. Memory SMD 0.31, GRADE moderate.
  6. 6. Eckert I, Pascher E. Letter to the Editor: double-counting due to inadequate statistics leads to false-positive findings. Nutr Rev. 2023;81(11):1495-1496. PMID 36644917.
  7. 7. Sandkühler JF, Kersting X, Faust A, et al. The effects of creatine supplementation on cognitive performance: a randomised controlled study. BMC Med. 2023;21:440. PMID 37968687. Preregistered double-blind crossover, n=123, 5 g/day × 6 weeks. Side effects RR 4.25 vs placebo (p=0.002).
  8. 8. Gordji-Nejad A, Matusch A, Kleedörfer S, et al. Single dose creatine improves cognitive performance and induces changes in cerebral high-energy phosphates during sleep deprivation. Sci Rep. 2024;14:4937. PMID 38418482. Acute crossover, 0.35 g/kg, 21 h sleep deprivation.
  9. 9. Smith-Ryan AE, Cabre HE, Eckerson JM, Candow DG. Creatine supplementation in women's health: a lifespan perspective. Nutrients. 2021;13(3):877. PMID 33800439. Narrative review; no skin outcomes.
  10. 10. Lenz H, Schmidt M, Welge V, et al. The creatine kinase system in human skin: protective effects of creatine against oxidative and UV damage in vitro and in vivo. J Invest Dermatol. 2005;124(2):443-452. PMID 15675966. Four co-authors affiliated with Beiersdorf AG.
  11. 11. Fischer F, Achterberg V, März A, et al. Folic acid and creatine improve the firmness of human skin in vivo. J Cosmet Dermatol. 2011;10(1):15-23. Beiersdorf AG. n=36 women, forearm, untreated-site control, no vehicle, no blinding described; product was Nivea Visage DNAge.
  12. 12. Peirano RI, Achterberg V, Düsing HJ, et al. Dermal penetration of creatine from a face-care formulation containing creatine, guarana and glycerol is linked to effective antiwrinkle and antisagging efficacy in male subjects. J Cosmet Dermatol. 2011;10(4):273-281. PMID 22151935. All authors Beiersdorf AG R&D. n=43, 6 weeks, sagging measured against baseline; penetration shown in ex vivo pig skin.
  13. 13. Topical application of creatine is multibeneficial for human skin. J Am Acad Dermatol. 2005;52(3 Suppl):P32. Meeting-abstract supplement; not indexed in PubMed and never published as a full paper.
  14. 14. Dechent P, Pouwels PJ, Wilken B, Hanefeld F, Frahm J. Increase of total creatine in human brain after oral supplementation of creatine monohydrate. Am J Physiol. 1999;277(3):R698. PMID 10484486. 20 g/day × 4 weeks produced an 8.7% mean increase (range 3.5–13.3%).
  15. 15. van der Merwe J, Brooks NE, Myburgh KH. Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby players. Clin J Sport Med. 2009;19(5):399-404. PMID 19741313. n=20. Hair was never measured; never replicated.
  16. 16. GNC purchase data reported via MedicalXpress, September 2025 (women 30% of creatine buyers, up from 18% in 2020; chain creatine sales +75% since 2020); Nutritional Outlook, creatine +71.9% in multi-outlet retail for the 52 weeks ending 30 November 2025, following +46.5% in 2024.
  17. 17. Free Soul, CreaGlow Creatine and Collagen Powder product page, accessed 28 August 2026. Claim language and ingredient-level attributions quoted as published.
  18. 18. Clean Program, Creatine + Collagen product page, accessed 28 August 2026. $42.00 for 30 servings.
  19. 19. ClinicalTrials.gov: NCT07580846 (ATENEA), sponsor Margan Biotech, observational single-arm adherence study, n=100 estimated, skin health an exploratory outcome, recruiting from March 2026; NCT04298840, Texas Tech University, creatine and global hair assessments, withdrawn, 0 enrolled.
  20. 20. Lak M, Forbes SC, Ashtary-Larky D, et al. Does creatine cause hair loss? A 12-week randomized controlled trial. J Int Soc Sports Nutr. 2025;22(sup1):2495229. PMID 40265319. n=45 randomized, 38 completed. No group-by-time effect on DHT, DHT:T or any hair outcome. Extensive disclosed industry conflicts among authors.
  21. 21. Commission Regulation (EU) No 432/2012. The sole authorised health claim for creatine concerns physical performance in successive bursts of short-term, high-intensity exercise at 3 g/day. No authorised claim exists for skin, hair, nails or appearance.
  22. 22. Retail pricing surveyed 28 August 2026: BulkSupplements creatine monohydrate 1 kg, $29.97 (200 × 5 g servings); Equate creatine monohydrate 15.87 oz, $14.88.
  23. 23. Montemarano M. NOW reports widespread failings in creatine gummy tests. Nutraceuticals World. HPLC testing of 12 brands; 6 failed label claim; creatinine contamination reported. One manufacturer disputed the findings.
  24. 24. Eghbali E, Arazi H, Suzuki K. Creatine hydrochloride versus creatine monohydrate alongside resistance training. Physiol Res. 2024;73(5):739-753. PMID 39545789. n=40, 8 weeks; HCl showed no benefit over monohydrate.
  25. 25. López-Moreno M, et al. Creatine supplementation in vegans: triple-blind randomised trial, n=20, 4 weeks. Eur J Appl Physiol. 2026. Serum creatinine rose without renal pathology; total body water increased approximately 1.4 kg.