What is E-400 D-Alpha-Tocopherol (VByotics) is a natural Vitamin E dietary supplement that provides 400 IU per pearl. Properties D-Alpha-Tocopherol Vitamin E groups together different compounds, such as Tocopherols and Tocotrienols. The most important in humans is D-Alpha-Tocopherol. Alpha-Tocopherol is a natural antioxidant from the Tocopherol family. When referring to the natural form, it is the dextro-rotatory stereoisomer called D-Alpha-Tocopherol, while the synthetic form is DL-Alpha-Tocopherol. The vitamin activity of D-Alpha-Tocopherol is 100, while that of Beta-Tocopherol is 40, Gamma-Tocopherol is 20, and Delta-Tocopherol is 1. What is it for One of the most important functions attributed to D-Alpha-Tocopherol Vitamin E is its antioxidant action. However, other functions not related to this action have also been observed. Among them are its effects on cell proliferation and phagocytic action in the immune system, which are in turn related to the vitamin's role as a messenger of cellular oxidative state.