What is Leucine Tablets L Leucine is an essential amino acid that has a signalling effect on muscle protein synthesis. As an essential amino acid it cannot be made by the human body and therefore must be consumed through food such as nuts brown rice and whole wheat bread or dietary supplements. Why use Leucine Tablets In total L Leucine is around eight per cent of the total amino acid count in your body's protein structures. It is also the fourth most concentrated amino acid in your tissue. Amino acids form the building blocks of protein and can help to reduce muscle protein breakdown (degradation of lean mass).Who can benefit Leucine is suitable for an individual wanting to increase their daily intake of L-Leucine and essential amino acids alongside a workout programme which can lead to the breakdown of muscle. To be taken as part of a varied and balanced diet and a healthy lifestyle.