Other names

L-leucine; Leucine; 61-90-5; (S) -2-Amino-4-methylpentanoic acid


L-Leucine is an essential amino acid and makes up approximately eight percent of the body’s protein structures. Leucine is involved in muscle recovery and growth along with L-Isoleucine and 1-Valine.

Operating principle

This amino acid helps maintain nitrogen balance and energy supply during times of stress. These qualities make this amino acid especially important for bodybuilders and other athletes who need strength and endurance. Leucine plays a very important role in regulating blood sugar levels. When this amino acid is insufficient, people will experience symptoms similar to hypoglycemia.


L-Leucine is used to maintain muscle mass, improve performance, and maintain health and wellness. The ability to synthesize more muscle protein allows the body to recover from exercise, perform better and counteract the negative effects of aging.


L-Leucine is safe for most adults when taken properly.


Scientists recommend a daily intake of 10 grams of leucine.