A fat-soluble vitamin with numerous forms, including alpha tocopherol (the only one the human body uses). It has anti-inflammatory properties, is essential in a vertebrate's nutrition, and supports the immune system, skin health, and cell function. It also carries other benefits such as being an antioxidant, widening blood vessels, reducing the risk of blood clots, and minimizing skin damage caused by ultraviolet radiation. Lack of vitamin E can lead to vascular abnormalities, degenerative changes in muscles, and infertility.