By Dr. Liji Thomas, MD Reviewed by Lauren Hardaker Mar 25 2026 Can a daily collagen supplement really improve your skin, or is the science still catching up to the hype? A new review explores the evidence behind collagen peptides and what they may, and may not, do for aging skin.  Study: The effects and mechanisms of collagen peptides for alleviating skin ageing . Image credit: fast-stock/Shutterstock.com Skin aging is closely linked to a deterioration in its collagen content. Collagen peptides