NOW Sports L-Leucine Powder 9 oz provides pure leucine in bulk powder form for athletes and bodybuilders who require significant amounts of this key branched-chain amino acid for muscle protein synthesis signaling. Leucine is the most anabolic of the essential amino acids and is the primary activator of mTORC1, the cellular signaling complex that initiates muscle protein synthesis. Adding leucine powder to meals, protein shakes, or post-workout drinks enhances the anabolic response to training, especially in aging adults who require higher leucine doses to trigger protein synthesis compared to younger individuals.

Non-GMO. Free of artificial additives and common allergens.