Vitamin E in its natural form is a powerful antioxidant which helps protect cellular function in the body, with an important role supporting muscle and nerve function. Horses that may need extra supplementation are performance horses, particularly those who are prone to muscle soreness, ty up, as well as horses with limited access to fresh grass. Vitamin E aids the uptake of selenium and in addition aids immune and reproductive function. It is always advised that electrolyte and selenium status is checked if your horse is becoming frequently sore with work (and despite adequate conditioning).