L-Leucine is considered an essential amino acid that must be obtained from the diet and cannot be synthesized in the body. It is abundantly found in high-protein foods such as lentils, beef, fish, chicken, nuts, pork, eggs, chickpeas, and milk. The Leucine we use is 100% plant based. Leucine is unique in that it is also a branched-chain amino acid, which can be oxidized in skeletal muscle, unlike other essential amino acids, which are mainly catabolized in the liver. Amino acids are often viewed as building blocks for the synthesis of proteins in the body. Leucine is much more than a building block and can signal cells to begin protein synthesis or muscle building. A cell-signaling pathway known as mTOR is responsible for initiating protein synthesis. Leucine is thought to act somewhere in this pathway, enhancing the pathway’s signals and causing it to increase production of proteins. Research studies support the use of leucine to lessen protein breakdown and muscle damage when consumed before exercise and to stimulate and enhance protein synthesis when supplemented after exercise.