Supplements for Breeding Stallions – Magnitude™ is a proprietary blend of omega-3 fatty acids (including DHA), antioxidants and vitamins. This combination has been shown in university studies to improve stallion reproductive performance by increasing semen production and progressive semen motility. The following link is a pdf with product information and research summary that you can view/print/download. Here is the link to the Product # 998450 in our store.