A4: Dry vitamin E is scientifically known as d-alpha tocopheryl succinate. The process of esterification allows the oil form of natural d-alpha tocopherol to be used in its 'dry' or 'non-oily' form for tablet and two-piece capsule formulations. When a vitamin E ester is used, the 'ol' in tocopherol is replaced by a 'yl'. Succinate is derived from succinic acid which is an organic substance found in and around cells of the human body. For those who experience difficulty digesting fats/oils, the succinate form of Vitamin E is preferable than the oil form of vitamin E.