Fact of the day

Across 11 randomised placebo-controlled trials in 805 people, oral collagen supplements improved skin elasticity, hydration and dermal collagen density, with no adverse events reported. Most trials used collagen hydrolysate at 2.5 g to 10 g a day for 8 to 24 weeks.

Study design

Systematic review

Journal

J Drugs Dermatol

Evidence

preliminary

⚠What it shows: Promising but early: a sweep of all the placebo-controlled trials found 11, totalling 805 people, and they varied in product, dose and duration. The reviewers themselves call the results preliminary, and the best dosing regimen is still unknown.Systematic review · J Drugs Dermatol