Now L-Leucine Powder Leucine is one of the three branched-chain amino acids (BCAAs) that is critical in muscle tissue structure. Among the BCAAs, leucine is a signaling molecule that helps to regulate optimal skeletal muscle protein synthesis in normal tissues. It also helps to maintain already healthy glucose metabolism and insulin function, and may help to promote the use of fat for energy. Leucine, in conjunction with adequate dietary protein, may help to build and maintain lean tissue and optimize body composition. Sports Leucine Powder is instantized for easy mixing in water, beverages or smoothies. No clumping. Recommended Use: Mix 1 level tablespoon into 8 oz. of water or other beverage 1 to 3 times daily, or as directed by a healthcare professional. Store in a cool, dry place after opening.