Even though leucine (a protein building block) turns on muscle-growth signals in the body, if you're already eating enough protein, taking extra leucine won't make you stronger, bigger, or recover faster.

Taking leucine — a protein building block — might turn on muscle-building signals in your muscles, but if you're already training and eating enough protein, it won't actually make you stronger, bigger, or recover faster.

Taking leucine supplements won’t help young athletes build more muscle, get stronger, or recover faster—even though leucine is known to trigger a muscle-growth signal in the body.

Leucine activates the mTORC1 signaling pathway to initiate muscle protein synthesis.

Taking extra leucine pills won’t help you build more muscle, get stronger, or recover faster from weight training if you’re already eating enough protein.

Taking leucine supplements won’t help healthy, fit young people build more muscle than taking a sugar pill, even if the supplement is strong enough to trigger a muscle-growth signal in the body.