BCAA stands for branched chain amino acid and refers to 3 of the essential amino acids - leucine, isoleucine and valine. Branched chain amino acids are a highly popular supplement among professional athletes, body builders and average fitness enthusiasts. Evidence has shown them to be beneficial to exercise performance, workout fatigue, muscle growth and muscle soreness. Here we take a look at the benefits of taking BCAAs, how to take them, review the best supplement brands on the market and more. Everything you wanted to know about BCAA supplements can be found right here.