Cox Vet Lab Vitamin E and SE Supplement is designed to help support muscle growth and regeneration, as well as enhance fertility in horses. It is formulated with Selenium which helps promote optimum growth and performance in horses, along with essential Vitamin E which helps relieve sore muscles and protect equines, especially working and performance ones from Azoturia or “Tying Up Syndrome”. These vital nutrients also helps improve their immune system and provides beneficial effect in the long run. It ccontains 2 mg of Selenium per oz. and 1,250 I.U. per oz. Recommended dose per day is 1 oz. This is a powder formula.