The internet says collagen is useless for muscle, but a randomized trial in older men with sarcopenia suggests it's more complicated. After 12 weeks of resistance training, men taking 15 g/day of collagen peptides gained about 45% more fat-free mass (+4.2 vs +2.9 kg) and more than twice the leg strength gains of the placebo group. The catch is that the placebo was silica, not protein, so extra protein alone may explain part of the effect. Here's what the study found, why collagen might help, and who might benefit.
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