Both the Selenium and Vitamin E are ALL NATURAL. Selenium and Vitamin E Gel is in a Real Gel ™ base that melts at body temperature so when administered it will not roll off the tongue. The Vitamin E level is 200 IU per 2ml (cc) dose. The maximum level of Selenium is at 3 ppm per animal. Each 2ml (cc) dose contains 23.2 mcg (1 ppm) of Selenium. This product is to be used as the sole source of Selenium. A butterscotch flavor has been added for increased palatability.