Adding this collagen supplement to strength training doesn't help middle-aged men reduce waist size more than a placebo or whey protein.

For middle-aged men doing strength training, whey protein and this collagen supplement have similar effects on muscle gain and fat loss.

Middle-aged men doing strength training and taking this collagen supplement lose 1.9 kg more body fat than those 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.

Strength training alone helps middle-aged men build muscle and lose fat, but adding this collagen supplement makes those improvements even better.

Doing strength training alone helps middle-aged men build stronger bones, but adding this collagen supplement doesn't make a bigger difference than a placebo or whey protein.