Goldman, David, Matthew Nagra, and Michael Greger. “Insufficient Evidence for Collagen Supplementation: A Critical Examination of Skin, Musculoskeletal, and Joint Health Claims”. International Journal of Disease Reversal and Prevention 8, no. 2 (October 12, 2026): 1–21. Accessed October 12, 2026. https://ijdrp.org/index.php/ijdrp/article/view/631.