Natural vitamin E is d-alpha-tocopherol, the biologically active form. Its molecular structure differs from the synthetic dl-alpha-tocopherol. The body absorbs and retains it about twice as well.
People take it for antioxidant support and immune function. It's a good choice when you want higher absorption or a natural source. Taking it with a meal that contains fat helps your body absorb it.
High doses may affect blood clotting.