Myos Muscle Formula comes in two different strengths. The veterinary strength, pictured below, is a more potent formula and the only product that has been clinically researched. This veterinary formula has extensive data to prove its effectiveness for rebuilding muscles and helping to prevent further muscle atrophy. This is the only product that Dr. Schepps recommends for this purpose and it requires a veterinary prescription. Please contact us for the Rx code necessary to purchase this product on theMYOS website.