Equine blood builder supplements, which are usually iron-rich, are believed to help build your horse's red blood cells. By increasing your horse's red blood cell count, you are potentially increasing their ability to efficiently transport oxygen to the muscles, which can help to improve your horse's performance. Choose from great brands such as Finish Line, Omega Alpha, Peak Performance Nutrients and more! With a blood buiding supplement, your horse may be going strong, but keeping them hydrated is equally important, so an electrolyte supplement may also be necessary. Click Here for information about electrolytes.