D-alpha tocopheryl succinate is just another name for natural vitamin E. It is also called d-alpha tocopherol, which may be followed by the words "acetate," "succinate," or "acid succinate." This is explained in our Vitamin E Supplements Review
-- which also explains that if you are looking for natural vitamin E, you'll want to look for more than just the word "natural" on the label
(not all products provide the tocopherols you may be expecting!).
The Review also explains differences
between natural and synthetic forms of vitamin E, and provides our tests
of many products claiming to contain the natural form, as well as the synthetic ("dl") form of vitamin E.