Ultimate Nutrition's Amino Gold 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 it is 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 amounts at the right time in the right place.