R-Aminoacid is the complementary feed designed to increase and give greater definition to muscle mass. It is formulated with branched-chain amino acids (L-Valine, L-Isoleucine, L-Leucine) and deficient amino acids (L-Lysine, L-Threonine, DL-Methionine). It is added with Vitamin B6 (Pyridoxine) to improve the booster effect of muscle absorption of branched-chain amino acids. Branched-chain amino acids are considered inhibitors of the formation of muscle lactic acid. Lysine, Threonine and Methionine are the three deficient amino acids in the horse's diet. From these important substances, the body is capable of forming other important substances useful for the metabolism of a sports subject, such as high quantities of Lysine which develop the synthesis of growth hormone (GH).