Overview
- The Anglia Ruskin-led umbrella review pooled 16 systematic reviews and 113 randomized trials covering 7,983 participants, published in Aesthetic Surgery Journal Open Forum.
- Evidence rated as high certainty shows modest improvements in skin elasticity and hydration, with no convincing effect on wrinkles or overall skin roughness.
- Supplements were consistently associated with reduced osteoarthritis symptoms such as joint pain and stiffness, with additional modest benefits for muscle and tendon structure.
- No meaningful improvements were found for post-exercise recovery or sports performance, and findings for oral and cardiometabolic measures were mixed.
- Researchers and consumer experts urge caution over bold marketing claims and cost, noting no approved health claims and calling for rigorous trials on optimal dosing, duration, and collagen sources.