The chemical building blocks of proteins are essential to the human body and all its processes. There are twenty-one in all and most are termed non-essential because they are produced by the body itself. Bodybuilders, however, deplete bloodstream levels of certain non-essential aminos (glutamine, for instance) swiftly, requiring supplemental intake. Other amino acids (the BCAAs valine, leucine, and isoleucine) can only be acquired through dietary intake, and are thus termed essential. Different aminos are linked to different processes, some of which are of special interest to bodybuilders. Arginine has been linked to vasodilation and nutrient delivery; tyrosine to focus and intensity; glutamine to muscle recovery after exercise. To achieve your bodybuilding goals, you need to know your aminos.