L-Isoleucine is one of the essential amino acids that cannot be made by the body and is known for its ability to help endurance and assist in the repair and rebuilding of muscle. This amino acid is important to body builders as it helps boost energy and helps the body recover from training.
L-Isoleucine is also classified as a branched-chain amino acid (BCAA). There are three branched-chain amino acids in the body, with the others being L-Valine, and L-Leucine, and all of them help promote muscle recovery after exercise. Isoleucine is actually broken down for energy within the muscle tissue.
BCAAs serve as important fuel sources for skeletal muscle during periods of metabolic stress; BCAAs may promote protein synthesis, suppress protein catabolism and serve as substrates for gluconeogenesis. BCAAs are catabolized in skeletal muscle, stimulating the production of L-alanine and L-glutamine, among other substances.