No study has suggested the stuff is harmful. But there are wrinkles in the supplement’s effectiveness https://www.economist.com/science-and-technology/2025/08/01/should-you-take-collagen?taid=6996d11ff7b4510001c16788&utm_campaign=editorial-social&utm_content=discovery.content&utm_medium=social-media.content.np&utm_source=twitter