In a double-blind, placebo-controlled study from 2014, 114 women aged 45-65 years were randomized to receive 2.5 g of a collagen peptide supplementation or placebo daily for eight weeks. Eye wrinkles were visibly and significantly reduced in the group given collagen (p<0.05) at 4 weeks and 8 weeks. Researchers also detected a significantly higher content of elastin and type 1 procollagen in the women given collagen.
Proksch E, Schunck M, Zague V, et al. (2014) Oral intake of specific bioactive collagen peptides reduces skin wrinkles and increases dermal matrix synthesis. Skin Pharmacol Physiol. 27(3): 113-9