Mega-Sel Liquid Formula For Horses, 1 Gallon (128 Fl oz)Mega Sel is a unique selenium and vitamin E supplement for horses. Mega Sel helps improve muscle tone, stamina, hair coat and hoof condition, and lessens muscle soreness in the shoulders, back and hind quarters. This liquid supplement adheres to the horse's grain and is palatable and readily consumed. Mega Sel liquid is proven more effective than powder or pellet selenium supplements. Selenium and Vitamin E supplement for supporting horse health