Oct 8, 2026 · 37 min
Collagen supplements promise more than the evidence delivers
Collagen Peptides: Should You Take Them?
The episode separates weak skin-aging claims from limited evidence that collagen may support stressed tendons and joints alongside exercise.
- 1High-quality trials do not convincingly show that collagen supplements prevent or treat skin aging.
- 2Exercise may help direct collagen-derived amino acids toward stressed tendons and joints, but the benefit appears limited.
- 3Protein-rich foods provide similar building blocks without the cost and contamination concerns of collagen powders.
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The episode’s key reversal is that collagen may be more plausible for exercised tendons and joints than for skin, because stressed tissue may use its amino acids more readily.
The brief
Collagen is a structural protein throughout the body, but supplements are marketed as if eating it sends fresh material directly to skin, hair, joints, and muscles.
Skin studies often report small improvements in wrinkles, hydration, or elasticity, yet those effects disappear in higher-quality trials and are clouded by placebo effects and industry funding.
Tracer experiments show that the gut breaks collagen into amino acids, which join the body’s general supply rather than traveling intact to the skin.
Keith Baar’s research points to a narrower possibility: exercise may make stressed tendons and joints more receptive to collagen-derived building blocks, though performance results remain mixed.
The practical verdict is modest. Collagen may have a limited role alongside exercise for connective tissue, while ordinary protein-rich foods offer comparable raw materials more cheaply.