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A 2021 meta-analysis of 19 RCTs (n=1,125) found that oral collagen peptide supplementation significantly improved skin hydration, elasticity, and reduced wrinkles compared to placebo. Skin hydration increased by a standardized mean difference of 0.53 and elasticity by 0.49 after 8-12 weeks of supplementation.
| Study | Participants | Finding | Quality |
|---|---|---|---|
Oral Collagen Supplementation: A Systematic Review of Dermatological Applications de Miranda RB, Weimer P, Rossi RC — Journal of Cosmetic Dermatology (2021) | 1,125 | Oral collagen supplementation improved skin hydration, elasticity, and reduced wrinkles across 19 RCTs | High |
For skin health, 2.5-10g/day of hydrolyzed collagen peptides for at least 8 weeks is well-supported. Both type I (marine) and type I+III (bovine) sources are effective. Taking collagen with vitamin C (50-100mg) may enhance collagen synthesis.
A systematic review and meta-analysis of 19 randomized controlled trials examining the effects of oral collagen peptide supplementation on skin hydration, elasticity, and wrinkle reduction in 1,125 participants.
Yes. A 2021 meta-analysis of 19 RCTs found that oral collagen peptides significantly improved skin hydration (SMD 0.53), elasticity (SMD 0.49), and reduced wrinkles. Results were consistent across different collagen sources and doses of 2.5-10g/day for 8+ weeks.
Most clinical trials show measurable skin improvements after 8 weeks of daily collagen supplementation. Some participants reported subjective improvements in skin hydration as early as 4 weeks. For wrinkle reduction, 8-12 weeks is typically needed to see results.
Both are effective. The meta-analysis found no significant difference between collagen sources. Marine collagen (type I) has smaller peptides and may absorb slightly faster, while bovine collagen (types I+III) is more cost-effective. Choose based on dietary preferences and budget.
Taking vitamin C alongside collagen is recommended because vitamin C is a required cofactor for collagen synthesis in the body. While not all clinical trials added vitamin C, the biochemical rationale is strong. A dose of 50-100mg of vitamin C with your collagen supplement is sufficient.