M.A.S.S. Builder® is the first supplement designed to support healthy weight that combines Gamma Oryzanol, L-Lysine, Threonine and Fenugreek for maximum efficacy. This unique formula is a non-steroidal product that is veterinarian recommended to support healthy weight and lean muscle development in the horse. M.A.S.S. is the only supplement of this type to include Fenugreek, a natural and effective substance that enhances the appetite in horses.