. Is there any truth to the claim that collagen supplements will help my skin, nails, hair, digestion and joints?
A. Some small studies suggest that collagen supplements may have limited benefits, but the evidence is far from definitive, and marketing claims seem to have gotten ahead of the science.
Collagen is the main structural protein in animals — humans included — and plays a vital role in tissues like bones, tendons, ligaments, cartilage and skin. It’s also increasingly popular in nutritional supplements, which claim to replenish these same tissues.