Taking collagen supplements while doing strength training is safe for older men with muscle loss, with no health issues found in the study.

Strength training boosts bone mass in older men with muscle loss, but adding collagen supplements doesn't make it better than just training alone.

Even though collagen protein is made of collagen, drinking it didn’t make the connective tissue inside muscles grow faster—even when combined with exercise.

Older men with muscle loss who do strength training and take collagen supplements gain more muscle mass (4.2 kg) than those taking a placebo (2.9 kg).

Strength training with this collagen supplement doesn't make middle-aged men significantly stronger in leg presses than taking a placebo.

Middle-aged men doing strength training and taking this collagen supplement build 1.6 kg more muscle than those taking a placebo.