Collagen is a scam: high-quality studies fail to demonstrate its benefits for joints, skin, or wound healing.

noli's read

Layne Norton highlights here the distinction between bioavailability and actual clinical efficacy. It is true that ingested collagen is broken down into amino acids in the digestive system, which makes its ability to specifically target the skin or joints—rather than being used as a standard protein by the body—uncertain. Meta-analyses, such as the one published in the 'International Journal of Dermatology', suggest modest improvements in skin elasticity and hydration, but the methodological quality of these studies is often considered low to moderate. Regarding joints, randomized controlled trials (RCTs) sometimes show pain reduction, but the results remain heterogeneous and often correlated with industry funding. Norton's argument is therefore based on the lack of robust and reproducible evidence to justify a high cost compared to a complete protein source. In summary, while collagen is not strictly 'useless,' the promised benefits are often overestimated compared to a diet rich in quality protein.

the sources

No named source held this one up — that absence is part of the verdict.