Recent science casts doubt on collagen's skin claims, but the Australian Institute of Sport says it may have a role in tendon and ligament health.
Athletes take it before a workout to strengthen tendons and ligaments. Others stir it into their morning coffee hoping to attain more youthful skin.
No, it's not creatine, but another much-hyped supplement beginning with a C.
Subscribe to gift this article Gift 5 articles to anyone you choose each month when you subscribe.
Author's summary: Experts doubt collagen's anti-ageing claims.