Like all protein sources, collagen supplements likely support muscle growth when combined with resistance training ( 31 ). In a study in 53 older men, those who took 15 grams of hydrolyzed collagen after resistance training for 3 months gained significantly more muscle than those who took a non-protein placebo ( 32 ).

How long does it take to see results from hydrolyzed collagen?

In general, most people will see a benefit after taking 10 grams of collagen peptides daily for 4-12 weeks.

Why is hydrolyzed collagen bad for you?

Additionally, collagen supplements have the potential to cause digestive side effects, such as feelings of fullness and heartburn ( 13 ). Regardless, these supplements appear to be safe for most people. Collagen supplements may lead to side effects, such as a bad taste in the mouth, heartburn, and fullness.