What is L Alanine? L Alanine is a non-essential amino acid & a key building block of protein. Non-essential means that the body can synthesise Alanine from other amino acids. However, L Alanine is actually the second most abundant amino acid in muscle tissue (after ), highlighting its importance. Performance Benefits L-Alanine is used for sports performance as it helps convert blood glucose into energy. It is absorbed from the blood in the liver & then converted to Pyruvate,