Do collagen supplements improve your skin? What the evidence says

Amber

Mixed or weak evidence

The short answer

Unproven. Pooled trials look positive for skin hydration and elasticity, but a 2025 meta-analysis found the benefit disappears in independent, high-quality trials. The positive results come mainly from studies funded by the collagen industry.

Where the claim comes from

Collagen gives skin its structure, and we make less of it as we age. The idea is that eating collagen peptides gives the body the building blocks, or signals, to make more. Collagen is broken down into amino acids and small peptides when we digest it, so whether it reaches the skin in a useful form has always been the key question.

What the strongest evidence shows

Earlier meta-analyses pooled all the available trials and found improvements in skin hydration and elasticity. A 2023 review of 26 trials reached that conclusion.

A 2025 meta-analysis in the American Journal of Medicine looked at 23 randomised trials with 1,474 participants, and this time split them by who paid for the study and how well it was designed. Trials funded by the industry showed benefits. Trials without industry funding, and the highest-quality trials, showed no significant effect on hydration, elasticity or wrinkles. The authors concluded there is currently no clinical evidence to support collagen supplements for preventing or treating skin ageing. Industry groups have disputed this interpretation.

The honest summary

Collagen supplements are unlikely to harm you, but the case that they visibly improve skin rests mostly on industry-funded research. Sunscreen, not smoking, and topical retinoids have much stronger evidence for skin ageing. If you enjoy your collagen, it is a personal choice, just know the evidence is far weaker than the marketing.

Sources

Last reviewed 23 September 2026 by the YourSpace Wellbeing team.

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Not medical advice. This article summarises published research for general education. It is not a diagnosis or a treatment recommendation. Always speak to a qualified healthcare professional about your own health.