Search
ToolsCalculators and checks built on our graded evidenceSee all
Ask Kymataanswers from our pages
GuidesArticles and guides, every claim citedSee all
Ask Kymataanswers from our pages
RankingsScored on one published rubric, prices checked by handSee all
Ask Kymataanswers from our pages

Women’s health · Trend check

Collagen for skin: what the trend gets wrong

Collagen powders are a billion-dollar category built on before-and-after photos. A 2025 meta-analysis found something striking: the positive results came from company-funded and lower-quality trials, while independent and high-quality trials found no effect. Daily sunscreen remains the best-proven skin-aging tool.

By Kymata Health Editorial Sources cited inline Prices checked Oct 29, 2026

Quick answer

The quick answer

  • Across 23 trials, collagen looked helpful overall, but trials without industry funding, and high-quality trials, found no effect on hydration, elasticity or wrinkles.
  • Astaxanthin improved skin moisture and elasticity slightly in small trials; wrinkles did not change.
  • Daily broad-spectrum sunscreen and not smoking have the strongest evidence for slowing skin aging; topical retinoids are well supported too.
  • If you enjoy collagen as a protein source, it is safe for most people; it is just not proven for skin.

We may earn a commission if you buy through these links. That never changes a rank. See how partner links work.

Story

Why this trend took off

Collagen is the main protein in skin, so swallowing collagen to rebuild skin sounds intuitive. It gets digested into amino acids and small peptides first, and the body decides where they go.

Early trials, many funded by collagen manufacturers, reported better hydration and elasticity. When independent researchers pooled the trials and split them by funding and quality, the effect disappeared.

In depth

What the 2025 meta-analysis found

  • All 23 trials (1,474 people): hydration, elasticity and wrinkles improved.
  • Trials without pharmaceutical-company funding: no effect on any of the three.
  • High-quality trials: no significant effect in any category.
  • The authors concluded there is currently no clinical evidence to support collagen supplements for skin aging.

The plan

What to do instead

  1. Step 1Daily sunscreen

    Broad-spectrum SPF 30 or higher, every day, reapplied outdoors.

  2. Step 2A retinoid at night

    Over-the-counter retinol or adapalene, started slowly; skip in pregnancy.

  3. Step 3Protein and sleep

    Adequate protein, vitamin C-rich foods and sleep support skin repair.

  4. Step 4Optional extras

    Astaxanthin has small positive trials; collagen if you like it as protein.

The stack

If you want an ingestible

Both optional and graded C. Sunscreen and a retinoid do more. Evidence grade: A strong · B moderate · C limited · D preliminary.

  1. 01Optional

    Astaxanthin

    Optional. Small improvements in skin moisture and elasticity; no clear change in wrinkles.

    What the research shows: A 2021 meta-analysis of 9 trials found oral astaxanthin improved skin moisture and elasticity versus placebo, but wrinkle depth did not change significantly. Small trials. (PMID 34578794, PMID 29941810)

    • Generally well tolerated; may turn stools reddish at high amounts.

    In the studies

    • Skin trials gave 4–12 mg of astaxanthin a day; two trials used 2 mg a day combined with collagen or tocotrienols.

    A record of what researchers gave, in whom; not a dose for you.

    Evidencelimited (Grade C)

    Quick pick · HerbsPro

    Brands that pay us are shown first in this list.

    NOW Foods Astaxanthin, 10 mg, 30 Softgels

    1 softgel: 10 mg astaxanthin (AstaReal, from Haematococcus pluvialis)

    $12.27price checked Oct 14, 2026 on HerbsPro’s site

    Shop at HerbsPro (paid link, opens in new tab)

    We may earn a commission if you buy through these links. That never changes a rank. See how partner links work.

    Also from our partners

    Only brands that pay us are listed here.

  2. 02Optional

    Collagen peptides

    Optional. Positive results come mostly from company-funded trials.

    What the research shows: Across 23 trials (1,474 people), collagen improved hydration, elasticity and wrinkles overall. But trials without industry funding, and the high-quality trials, showed no effect, and the authors concluded there is currently no clinical evidence to support collagen for skin aging. (PMID 40324552)

    • Generally well tolerated. Choose marine or bovine based on allergies and diet.

    In the studies

    • The 23 trials in the 2025 meta-analysis gave collagen supplements daily; amounts and durations varied and are not given in its abstract.

    A record of what researchers gave, in whom; not a dose for you.

    Evidencelimited (Grade C)

    Quick pick · Momentous

    Brands that pay us are shown first in this list.

    Momentous Collagen Peptides

    10 g bovine collagen + 5 g FORTIGEL collagen peptides + vitamin C

    $54.99see label · price checked Oct 29, 2026 on Momentous’ site

    One-time
    $54.99
    Subscription
    $41.24
    Subscribe 25% off

    Shop at Momentous (paid link, opens in new tab)

    We may earn a commission if you buy through these links. That never changes a rank. See how partner links work.

    Also from our partners

    Only brands that pay us are listed here.

    Subscribe & save 25%. Pick “Subscribe 25% Off” on the product page; delivery every 1, 2 or 3 months; cancel or reschedule anytime.

    • Subscription price shown on each product card.
    • Our Momentous links apply the brand’s ambassador discount at checkout, so there is no code to type. Momentous sets any discount it applies; check the cart total before you pay.
    • Offer terms from Momentous’ site, checked Oct 8, 2026. Offers can change; the brand's checkout is final.

Listed picks above total $67.26 at one-time prices on the brands' own sites; most hold about a month of servings at the label's serving size.

Left out

What we left out, and why

Collagen "beauty drinks" with added extras
Often small collagen amounts plus sugar and flavors, at premium prices.
Glutathione pills for "glow"
Poorly absorbed by mouth, with little human evidence for skin, and some products are marketed for skin lightening.

Safety

Safety and interactions

  • New, changing or bleeding spots need a dermatologist.
  • Not medical advice. Check with your clinician or pharmacist before starting supplements if you take prescription medicines, are pregnant, trying to conceive or breastfeeding, or have kidney, liver or thyroid disease.
  • Supplements are not evaluated by the FDA to diagnose, treat, cure or prevent any disease.

Questions

Frequently asked questions

Does collagen work for wrinkles?

A 2025 meta-analysis of 23 trials found benefits only in company-funded and lower-quality trials; independent and high-quality trials showed no effect on hydration, elasticity or wrinkles.

Does astaxanthin help skin?

Small trials found astaxanthin improved skin moisture and elasticity slightly, but wrinkle depth did not change significantly.

What actually slows skin aging?

Daily broad-spectrum sunscreen and not smoking have the strongest evidence, followed by topical retinoids.

Sources

Sources

Studies were checked on PubMed on Oct 31, 2026. Product prices come from each brand's own site, read on Oct 29, 2026; each product shows the date its price was read.

  1. 1Myung SK et al. Effects of collagen supplements on skin aging: systematic review and meta-analysis of randomized controlled trials. Am J Med 2025 (opens in new tab)PMID 40324552
  2. 2Zhou X et al. Systematic review and meta-analysis on the effects of astaxanthin on human skin ageing. Nutrients 2021 (opens in new tab)PMID 34578794
  3. 3Ito N et al. Astaxanthin and UV-induced skin deterioration in healthy people: randomized, double-blind, placebo-controlled trial. Nutrients 2018 (opens in new tab)PMID 29941810

Supplement stacks: every pageAll stacksBrowse all topics

The sleep stackAlso in: Supplements and vitamins

Educational only. Not medical advice.

We earn a commission on some links. That never changes a rank. How we make money: kymatahealth.com/affiliate-disclosure.