The study the marketing quotes
A 2023 meta-analysis pooled 26 randomized trials with 1,721 participants. It found collagen supplements improved skin hydration and elasticity. That is the study on every label.
It is also the weaker study. Read on.
The 2025 review that changed the picture
A sharper systematic review in the American Journal of Medicine pooled 23 trials with 1,474 participants. Then it asked a harder question: what happens when you keep only the trials without pharmaceutical-company funding?
The benefits vanished. In unfunded trials, and in higher-quality trials, the effects on hydration, elasticity, and wrinkles were no longer statistically significant. (PubMed 40324552)
What that means for your wallet
Modest benefits show up in industry-funded and lower-quality trials. Independent, high-quality evidence does not currently support anti-aging claims. You may be buying a placebo with excellent branding.
This does not make collagen companies villains. It makes their trials predictable. Funded research finds what funds it.
What actually slows skin aging
Sunscreen. Daily, real SPF, reapplied. That one has the trials.
Topical retinoids come next. Neither comes as a tasty powder, which is probably why nobody markets them as hard. (Medscape)
This guide is general information, not medical advice. If symptoms stick around or worry you, talk to a doctor.
Questions, answered
Does collagen powder do anything at all?
It may slightly improve skin hydration in some trials. The wrinkle-erasing claims do not survive high-quality testing.
Is collagen powder safe?
Generally, yes. It is a protein supplement. Safe and effective are two different questions.
What actually reduces wrinkles?
Sunscreen and topical retinoids. Those have real trials behind them. Collagen powder does not.