Thorne Amino Complex is a comprehensive blend of EAAs, which is high in branched-chain amino acids (BCAAs) - a group of amino acids that promote the growth of lean muscle mass and enhance muscle strength.* Amino acids are the building blocks of protein. They fuel muscle gain and other physiological functions, including enzyme production, hormone regulation, cognitive ability, neurotransmitter balance, metabolism, and energy production. As we age, we lose muscle mass, which can cause other health issues, so it is important to promote the growth of lean muscle mass.Of the 20 amino acids that make up protein, nine are classified as essential amino acids (EAAs), those the body cannot produce itself. Therefore, they must be consumed through diet and supplementation to support the bodys internal production of energy.Thorne Amino Complex stands out with its commitment to quality. Because athletes need to know their supplements are trustworthy and compliant, every batch of an NSF Certified for Sport product like Thornes Amino Complex is tested for compliance with label claims and to ensure the absence of more than 200 substances banned by many major athletic organizations. Available in both bulk powder and convenient individual stick packs, it offers flexibility to suit your lifestyle. Pick your favorite flavor, berry or lemon, and embrace the benefits of a premium amino acids supplement that helps you achieve your health and fitness goals with confidence.*