Collagen Supplements: What Evidence Shows Now
The Current Evidence for Oral Collagen
Meta-analyses of 30+ randomized trials now confirm that hydrolyzed collagen peptides (2.5-10g daily) improve skin elasticity, hydration, and dermal collagen density over 8-12 weeks. The effect is modest but statistically significant.
Type I vs Type II vs Type III
- Type I (bovine/marine): targets skin, hair, and nails — most evidence for beauty
- Type II (chicken sternum): targets joint cartilage — limited skin benefit
- Type III (bovine): supports skin structure alongside Type I
Optimal Dosing and Timing
Take 5-10g of hydrolyzed collagen peptides daily on an empty stomach or with vitamin C (which aids collagen synthesis). Marine collagen has smaller peptides and may absorb better. Results appear in 8-12 weeks for skin, 3-6 months for nails.
What Collagen Cannot Do
Collagen supplements will not replace topical retinoids for anti-aging, erase deep wrinkles, or substitute for sunscreen. Think of them as a supportive measure alongside a comprehensive skincare routine.
