Leucine

Other names: (2S)-2-amino-4-methylpentanoic acid

Leucine, also known as (2S)-2-amino-4-methylpentanoic acid, is one of the nine essential amino acids that the body cannot produce on its own and therefore must be taken in through diet or supplements. It is one of the three branched-chain amino acids (BCAA), along with isoleucine and valine. BCAAs make up to a third of muscle protein and play a key role in the process of muscle growth and recovery.

Leucine is present in many protein-rich foods such as meat, fish, eggs, dairy, soy and nuts. All of these products are thus essential sources of this essential element. Leucine is also commonly used in dietary supplements and sports nutrition, especially in people who engage in bodybuilding or other forms of strength training. This is because leucine has the ability to stimulate protein synthesis in muscles, which promotes muscle growth and also helps in muscle recovery after strenuous exercise. In addition, leucine is also used in some medicines and is part of a therapy for patients with muscle atrophy or as part of nutritional support for the seriously ill and convalescent.