1.Vitamin e is a class of organic chemical compounds (more precisely, various methylated phenols), many of which have vitamin E activity.
2.Vitamin e, as a food additive, is labeled with these E numbers: E306 (tocopherol), E307 (α-tocopherol), E308 (γ-tocopherol), and E309 (δ-tocopherol). These are all approved in the USA, EU and Australia and New Zealand for use as antioxidants.
3.Vitamin e is the form of vitamin E that is preferentially absorbed and accumulated in humans.
The measurement of “vitamin E” activity in international units (IU) was based on fertility enhancement by the prevention of miscarriages in pregnant rats relative to alpha-tocopherol.