The Effects of Oral Supplementation of Natural Keratin Hydrolysate on Skin Aging: A Randomized, Double-Blind, Placebo-Controlled Clinical Study in Healthy Women

The study examined the effects of oral supplementation with natural keratin hydrolysate (FKH) on skin aging in 99 healthy women aged 35-65 over 90 days. This randomized, double-blind, placebo-controlled trial found that FKH significantly improved skin elasticity, firmness, smoothness, hydration, and overall appearance compared to placebo. Participants taking 500 mg or 1000 mg of FKH daily reported enhanced skin, hair, and nail gloss, with the 1000 mg dose showing slightly better results. The study concluded that FKH effectively reduces signs of skin aging and supports skin homeostasis, suggesting its potential as a novel anti-aging strategy.