The Finish Line Performance Builder Horse Muscle Development Supplement is a healthy, muscle-building supplement for horses that supports muscle health and overall performance. Performance Builder is safe and effective for horses of all ages, including weanlings, yearlings, older horses and pre sale horses. This formulation works in weeks, not months! The active ingredients in this horse muscle supplement include oryzamax blend, l-leucine, kale and methionine. Oryzamax is a proprietary blend of gamma oryzanol, calcium HMB, spinach, beet powder, tart cherry, carrot and asocrbyl palmitate. Comes in a 30 oz. package.