Made with Non-GMO Ingredients Performance & Recovery L-Leucine - 1,250 mg L-Isoleucine - 625 mg L-Valine-625 mg Dietary Supplement Discussion: The Natural Sport BCAA 2500 is a blend of the branched chain amino acids, L-Leucine, L-Isoleucine and L-Valine. BCAA's are essential amino acids that are mainly absorbed by skeletal muscle where they may help support protein synthesis. Natural Sport is an innovative sports supplement brand that is clean and healthy, not over engineered and designed for all lifestyles.