BCAA's (branched chain amino acids) are among the most effect sports supplements known. When we talk about BCAA's we actually mean the essential amino acids leucine, isoleucine and valine. As you might already know, amino acids are the building blocks of protein. During digestion protein is broken down into non-essential amino acids and essential amino acids. You need both types of amino acids, but your body can produce non-essential amino acids from the essential ones. Find more sports nutrition related topics at nutrition main, or click here to learn more about sports supplements.