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Glass jar of collagen capsules beside a wooden spoon of powder on a white marble counter
Supplements

Collagen supplements for skin: what the evidence really says

By Juvenate Editorial Published Last updated

Collagen is one of the best-selling beauty supplements, and the pitch is simple: your skin loses collagen with age, so swallowing collagen should help replace it. It is an appealing idea. But when researchers pool the trials and look closely at who paid for them and how well they were run, the picture is a lot less convincing than the marketing. Here is a plain-language look at what the evidence does and does not show.

This is not medical advice. Talk with your doctor, pharmacist or other healthcare professional before starting any supplement, especially if you are pregnant, take medicines or have a health condition. No affiliate links. Disclosure.

What collagen supplements are

Collagen is the main structural protein in skin, and the supplements studied in most trials are hydrolyzed collagen, sometimes called collagen peptides. These are collagen proteins that have been broken into smaller pieces, usually sold as powders, drinks or capsules.

These are not the same as the peptides in skin creams, and they are not the same as injectable “research peptides” (which we discuss, with plenty of caution, in peptides, explained). This post is only about collagen taken by mouth.

The case in favor: a 2023 meta-analysis

A 2023 systematic review and meta-analysis in the journal Nutrients pooled 26 randomized controlled trials involving 1,721 people. It found that hydrolyzed collagen supplementation significantly improved skin hydration and elasticity compared with placebo. The authors also noted that the effect on hydration varied by collagen source and by how long people took the supplement.

That sounds like good news, and it is the kind of finding that gets quoted on product pages. But the same paper also reported that it “identified several biases in the included RCTs” and said larger, better trials are needed to confirm the findings. In other words, even the optimistic review flagged weaknesses in the underlying research.

The case for caution: a 2025 meta-analysis

In 2025, researchers Myung and Park published another meta-analysis in the American Journal of Medicine, this time with a specific question: does the result change depending on who funded the study and how good the study was?

They analyzed 23 randomized trials with 1,474 participants. When they pooled all 23, collagen supplements significantly improved skin hydration, elasticity and wrinkles. But when they split the studies by funding source, a pattern appeared:

  • Studies not funded by pharmaceutical companies found no effect of collagen on hydration, elasticity or wrinkles.
  • Studies funded by pharmaceutical companies found significant effects.
  • High-quality studies found no significant effect in any category. Low-quality studies showed an improvement in elasticity.

Their conclusion was blunt: there is currently no clinical evidence to support using collagen supplements to prevent or treat skin aging.

Funding is not proof of wrongdoing, and these reviews can be debated. But it is exactly why scientists look at funding and study quality, not just headline numbers.

And the debate continues

This is an active argument among researchers. A 2026 paper by Grimes and Mahto, titled “Hydrolyzed Collagen for Skin Aging Meta-Analyses Are Unreliable,” went further and criticized the meta-analyses on this topic themselves. We have only read the title, so we will not summarize its arguments, but it shows that this is far from settled.

What can we say fairly?

  • Some trials report modest improvements in skin hydration and elasticity.
  • Those results appear to depend heavily on funding and study quality.
  • The independent and high-quality studies in the 2025 review did not find a benefit for wrinkles.
  • No review we read shows that collagen supplements make wrinkles go away.

What about safety and regulation?

The U.S. Food and Drug Administration says it is not authorized to approve dietary supplements for safety and effectiveness before they are marketed, and that in many cases companies can introduce supplements to the market without even notifying the FDA. That is not a reason to panic, but it means the label claim is not a regulatory verdict, so “clinically proven” on a tub deserves a second look.

The FDA’s advice is to be informed and to talk to your doctor, pharmacist or another healthcare professional before deciding to buy or use a supplement. If you take medicines or have a medical condition, that conversation matters even more.

If you want firmer-looking skin, start here

The tools with the best evidence are less glamorous than a powder:

  • Daily sunscreen. A randomized trial found daily sunscreen users had less skin aging over about four and a half years than people who used it only when they chose. We explain it in sunscreen and anti-aging.
  • A retinoid, if your dermatologist agrees. The American Academy of Dermatology says retinoids can reduce fine lines and wrinkles, and a 2025 meta-analysis of randomized trials found tretinoin improved facial wrinkles.
  • Enough protein overall. Collagen is a protein, and your overall protein intake matters. This is especially relevant if your appetite is low, for example on a GLP-1. See our protein guide. Our free GLP-1 Glow-Up Guide covers the skin basics in one place.

If you decide to try collagen anyway

Plenty of people try it, and that is a personal choice. If you do, a few grounded tips:

  1. Check with your doctor or pharmacist first, as the FDA recommends.
  2. Treat it as an experiment, not a fix. Keep sunscreen and your other basics in place so you are not giving up proven habits.
  3. Be wary of dramatic claims. Anything promising to “reverse aging” or “rebuild collagen” is overstating the evidence.
  4. Give it an honest time frame, then decide. If you notice nothing, that is useful information too.

You can browse our other supplement guides for more evidence-based overviews.

The bottom line

The evidence that collagen supplements improve aging skin is much weaker than the marketing suggests, so check with your doctor or pharmacist before trying one. In the 2025 review, the positive results came from studies funded by pharmaceutical companies, while studies without that funding found no effect. Spend your effort and money first on sunscreen, good basic skincare and adequate protein.

Sources

  1. Myung SK, Park Y. Effects of Collagen Supplements on Skin Aging: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Am J Med. 2025 (abstract)
  2. Pu SY, Huang YL, Pu CM, et al. Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis. Nutrients. 2023
  3. Grimes D, Mahto A. Hydrolyzed Collagen for Skin Aging Meta-Analyses Are Unreliable. J Cosmet Dermatol. 2026 (title only; not reviewed in full)
  4. U.S. Food and Drug Administration. Information for Consumers on Using Dietary Supplements
  5. American Academy of Dermatology. Retinoid or retinol?
  6. Huang HY, Lee LT. Tretinoin for Photodamaged Facial Skin: Systematic Review and Meta-Analysis of Randomized Controlled Trials. Dermatol Pract Concept. 2025
  7. Hughes MC, Williams GM, Baker P, Green AC. Sunscreen and prevention of skin aging: a randomized trial. Ann Intern Med. 2013;158(11):781-790