Shop Optimum Nutrition - BCAA 1000 Capsules, featuring a 2:1:1 ratio of leucine, isoleucine, and valine to assist with muscle synthesis and recovery. Each capsule contains 1000mg of branched chain amino acids, these amino acids are essential meaning they cannot be produced by the body and must be introduced via whole foods or dietary supplements and are criitcal for muscle growth and exercise performance enhancement.