WHAT IS LEUCINE? BULK POWDERS™ provide you with 100% Pure Pharmaceutical grade L Leucine. Leucine is an essential amino acid, which we are required to obtain from either food or supplementation. It is also one of the three Branch Chain Amino Acids’ (BCAA’s) along with Isoleucine & Valine. Leucine has recently become one of the most popular supplements, due to its inclusion in BCAA & Post-Workout supplements. The increased popularity can be put down to the abundance of strong,