Vitamin E is one of those nutrients that every horse needs  — but it also raises a lot of questions for owners: Should you supplement it? How much is too much or too little? And could the wrong form really make a difference?  Let’s break down what science and experts are saying so you can decide what’s right for your  horse. Why Vitamin E Matters for Horses Vitamin E (primarily as alpha-tocopherol) is a fat-soluble antioxidant  that plays a key role in: Muscle and nerve healt