Glycine is belongs to 22 essential amino acids (synthesized within the body) constructing proteins, and non-protein component of enzymes i.e. heme. It is a inhibiting neurotransmitter allowing for improvement in sleep comfort even at a dose of 3 g at bedtime. Glycine (as arginine) is a precursor of creatine. It is essential for the synthesis of a strong antioxidant - removing free radicals out of the body - glutathione. It is cholagogic and cholepoiteic. By interfering with the synthesis of growth hormone, accelerates the biological recovery of an organism. Naturally present in foods of plant and animal origin. In the sports supplementation is a component creatine stacks, amino acid supplements, protein supplements based on natural ingredients and carbohydrate and protein.