What are BCAA Tablets? BULK POWDERS™ Branched Chain Amino Acid Tablets 1000mg deliver the optimal 2:1:1 ratio of Leucine, Isoleucine & Valine. Bodybuilders & strength trainers have known about the benefits of BCAA for years, & there is more & more research being published in relation to their effect on increasing protein synthesis & reducing muscle breakdown. BULK POWDERS™ Branch Chain Amino Acids comprise of leucine, isoleucine & valine in a 2:1:1 ratio. These three