Ultra-Sel combines optimal selenium absorption and high bioavailability vitamin E with MULTI-PLEX magnesium, a proprietary brand of magnesium to support muscle metabolism. The unique magnesium blend provides quick absorption in the stomach as well as sustained absorption beyond the stomach. The blend includes a high absorption of chelated organic magnesium which provides protection against potassium interference. Potassium in the diet can render many magnesium products useless, or deplete their effectiveness.Indications:For horses in low selenium areas or those requiring a performance level of selenium in the blood. Also for use on horses experiencing muscle soreness problems and those prone to tying-up syndrome.Directions:-Maintenance – mix 1 oz. (30ml) daily per 500 lbs. (Approx. 225 kg) animal weight into feed.-Intense Work – mix 1 oz. (30ml) twice daily per 500 lbs. (Approx. 225 kg) animal weight into feed.Expect Results:Within 14 days.