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Branched-Chain Amino AcidsFortified with Vitamin B6Dietary SupplementSupports Endurance During Workouts and Muscle Recovery AfterwardEssential for Muscle Protein SynthesisScience-Backed Quality Since 1969Don't short-change your muscle-building progress—fuel up for maximum gains with Swanson Branched-Chain Amino Acids. Essential building blocks for protein synthesis branched-chain amino acids play vital roles in muscle growth and recuperation. Our advanced formula features three branched-chain amino acids L-leucine L- isoleucine and L-valine fortified with a generous supply of vitamin B6 to enhance their metabolism.