Tested BCAA 1360 is a convenient way to load your system with branched chain amino acids (BCAA's), which are often considered the building blocks of muscle mass and size. BCAA's supplementation is necessary due to their unique structure which the body cannot produce on its own. BCAA's have been shown to increase nitrogen retention and protein synthesis. We devote a significant amount of resources to testing in the lab and in testing on athletes. Our ingredients are rigorously tested by our suppliers and our finished products are tested to ensure they meet our strict specifications for quality and purity.