Free Form Amino Acid Essentials Helps Convert Food to Energy Fuels Fat Loss & Supports Endurance Dietary Supplement L-Carnitine Athletic Performance and Endurance GAT L-Carnitine is one of the most versatile supplements for athletes looking to improve athletic performance and endurance. L-Carnitine helps the body produce energy - providing support and endurance exercise (aerobic) and during recovery from high intensity activities such as weightlifting and sprinting (anaerobic). Supplementing with this fast-acting formula helps to maximize muscle carnitine concentrations at the gym or before athletic competition.