All life depends on proteins. Proteins carry out all biological functions in living organism including humans. Proteins are made of amino acids, which are their basic building blocks. Essentially, amino acids are strung like beads in long chains in proteins. In the body, proteins are made from individual amino acids. Therefore, nutritional supplementation with amino acids ensures that all cells, tissues, and organs in the body have a ready supply of amino acids. Ultimate Nutrition's Super Whey Amino 2000 contains all of the most important amino acids and branched chain amino acids for optimal nutritional support. These amino acids, of course, provide the body with the support to produce proteins. Amino acids, however, carry out other important functions. Nutritional supplementation keeps the amino acid supply in the bloodstream within healthy range. Under some circumstances, such as stress whether due to high-intensity exercise or other reasons, amino acids in the blood can be depleted so that important substances in the body cannot be produced in the right amount at the right time and in the right place. Hence, supplementation with amino acids is critical to maintain appropriate amounts of amino acids, which promote good health. Ultimate Nutrition's Super Whey Amino 2000 also contains sulfur-containing amino acids methionine and cysteine. These amino acids have been shown to help prolong life span. Typically, as people age, the amounts of these two amino acids decrease considerably. Since dietary supplementation with cysteine prolonged the life span of guinea pigs, a report in the New England Journal of Medicine suggested that maintaining optimal levels of methionine and cysteine could potentially promote longevity in humans.