Collagen does something. It just isn't the thing on the box. The biggest 2026 review, 113 trials and 7,983 people, found real gains in skin elasticity and hydration, but those are lab probe readings, not fewer wrinkles: roughness showed no proven effect. And the skin benefit tracks the invoice. When Myung and Park split 23 trials by funding, industry-backed studies showed an effect and the independent ones showed none. Their verdict: "there is currently no clinical evidence to support the use of collagen supplements to prevent or treat skin aging." It may help your joints more than your face. A modest, low-risk supplement wearing a claim two sizes too big.