L-Leucine is an essential amino acid.

L-Leucine is mainly used to provide support for athletic and sports performance, as it helps preserve lean muscle tissue. L-Leucine also supplies the body with energy when under engaging in athletic activity, it preserves muscle glycogen (glucose stored in muscle tissue used to power muscular contraction) and it maintains the body's nitrogen balance. Also, L-Leucine may increase Human Growth Hormone (HGH) secretion. L-Leucine supports muscle growth, repair and maintenance by providing the gateway for the body to use the protein it consumes, which is important for strength, power and endurance athletes.