If you fear your horse is underweight and are looking for a supplement to help improve this, than Weight Builder is the perfect product. Weight Builder provides concentrated calories in the form of fat. Contains flax meal, which is high in omega 3 fatty acids. Also contains protein, fat, fiber, calcium and phosphorus. Provides extra calories for healthy weight, body condition and fuel for performance. Aside from gaining weight, your horse visibly have a more beautiful coat and skin. Comes with 8 lbs. of product.