M.A.S.S. Builder® is designed to help maintain healthy weight by combining L-Lysine, Threonine and Fenugreek for maximum efficacy. This unique formula is a non-steroidal product that is veterinarian recommended to help maintain 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.M.A.S.S. Multi-Active Strengthening System, supplies nutrients to help strengthen your horse’s muscles. The combination of several ingredients meets all the demands of your horse, plus Fenugreek helps maintain a healthy appetite. It is rich in vitamins and minerals and high in protein. Contains two essential amino acids, lysine and threonine, which have been proven to help support optimum weight. Also contains gamma oryzanol, an extract from rice bran oil that helps support the endocrine system for natural production and balance. Highly palatable. Dosage is 1 oz. daily to top dress feed. Guaranteed analysis per serving: 1500mg/oz of gamma oryzanol, 2000 mg/oz of l-lysine, and 1000 mg/oz of threonine.