Getting your leucine and other BCAAs from food is safest for most people. The Food and Drug Administration does not regulate supplements, so they may not contain precisely what they say they do.

A study published in the Journal of the International Society of Sports Nutrition found that athletes who were supplemented with BCAAs experienced 33% less muscle soreness compared to those who didn’t ...

The body can't make its own, so foods that contain valine and other BCAAs are an important part of a healthy diet. Research has focused on the role of valine supplements in muscle growth ...