Daily Collagen Peptide Supplement Improves Skin Hydration, Elasticity, and Wrinkles in Women

What the researchers found

Daily oral intake of 1,650 mg of collagen peptide NS (CPNS) — rich in the bioactive dipeptides Gly-Pro and Pro-Hyp — produced statistically significant improvements in multiple skin health markers compared to placebo.

Skin desquamation (flaking) and hydration showed early improvements, reaching significance at 4 weeks. Skin wrinkling and elasticity required a longer treatment period, achieving significance at 12 weeks. The staggered timeline suggests collagen peptides may first address surface-level moisture and barrier function before influencing deeper structural properties like elasticity.

Why it matters

Collagen supplements are one of the most popular categories in the peptide and beauty supplement market, but rigorous clinical evidence has been uneven. This well-designed RCT provides strong support for oral collagen peptides improving measurable skin outcomes, with a clear dose, timeline, and safety profile — the kind of data consumers and clinicians need to evaluate these products.

The numbers in context

n=100 · 1,650 mg/day CPNS · 12 weeks · hydration improved at 4 weeks · elasticity improved at 12 weeks · 0 side effects reported

How the study worked

This was a randomized, double-blind, placebo-controlled clinical trial involving 100 women aged 30 to 60. Participants were assigned to either the collagen peptide group (1,650 mg/day of CPNS) or a placebo group for 12 weeks. Researchers measured skin hydration, elasticity, desquamation, and wrinkling at multiple time points throughout the study.

Who was studied

Women aged 30–60 years

What this study cannot tell us

The study was conducted in a single cohort of women aged 30–60, so results may not generalize to men or younger/older populations. The specific brand formulation (CPNS) may differ from other collagen products on the market. The 12-week duration leaves long-term maintenance effects unknown, and the study did not report effect sizes or confidence intervals in the abstract.

How to read the evidence

This is a randomized, double-blind, placebo-controlled trial — the gold standard for clinical evidence. The sample size of 100 is moderate, and multiple skin outcomes were measured at defined time points.

When this study was published

Published in 2023, this study reflects current research on oral collagen peptides and remains highly relevant to the growing interest in evidence-based beauty supplements.

The bigger picture

Oral collagen peptide supplementation is a rapidly growing market, but clinical trials with rigorous designs have been limited. This RCT adds to a growing body of evidence that specific bioactive dipeptides like Gly-Pro and Pro-Hyp can be absorbed orally and produce measurable skin improvements. The staggered response timeline — hydration first, then structural changes — aligns with our understanding of how collagen turnover works in skin tissue and may help set realistic expectations for consumers.

Questions still open

• How long do the skin improvements last after stopping supplementation?
• Would lower or higher doses produce different results, and is there a dose-response relationship?
• Do men or older adults experience similar benefits from the same collagen peptide formulation?

Common questions

Read the original research

Oral intake of collagen peptide NS improves hydration, elasticity, desquamation, and wrinkling in human skin: a randomized, double-blinded, placebo-controlled study.

Food & function, 14(7), 3196-3207

Citation

Lee, Miyeong; Kim, Eunjoung; Ahn, Hyunwoo; Son, Seokjun; Lee, Hyunjun. (2023). Oral intake of collagen peptide NS improves hydration, elasticity, desquamation, and wrinkling in human skin: a randomized, double-blinded, placebo-controlled study.. Food & function, 14(7), 3196-3207. https://doi.org/10.1039/d2fo02958h