Collagen supplements show mixed health benefits in clinical studies

A large review of clinical trials indicates that collagen supplements may improve skin hydration and elasticity, reduce joint discomfort, and support muscle health. However, the results are not consistent across studies.

The variability stems from differences in collagen sources (beef, pork, poultry, fish, marine organisms, and plant‑based alternatives), dosages, administration methods, and study designs. Many trials involved small participant numbers and short follow‑up periods, leading to methodological weaknesses.

Experts note that additional factors such as diet, sun exposure, sleep quality, smoking, hormonal status and lifestyle also influence outcomes, making it difficult to isolate the effects of collagen alone. They call for higher‑quality, larger‑scale research to determine which types of collagen, if any, provide reliable benefits.