Balance and coordination get better with strength training for older men with muscle loss, but collagen supplements don't make it better than training alone.

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

Older men with muscle loss who take collagen supplements during strength training lose more body fat (5.4 kg) than those taking a placebo (3.5 kg).

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 in the quadriceps muscles improves more (16.5 Nm) in older men with muscle loss who take collagen supplements during strength training than those taking a placebo (7.3 Nm).

When older men with muscle loss take collagen supplements during strength training, gaining muscle is more closely linked to losing fat compared to those taking a placebo.