A Collagen Supplement Improves Skin Hydration, Elasticity, Roughness, and Density: Results of a Randomized, Placebo-Controlled, Blind Study.
Nutrients. 2019 Oct 17;11(10):2494. doi: 10.3390/nu11102494.
Nutrients. 2019.
PMID: 31627309
Free PMC article.
Clinical Trial.