Why natural vitamin eresearch has shown that vitamine from natural sources delivers twice the bioavailability of synthetic forms if you look at the ingredients list on the packetjar of vitamin e you will see either d alpha or dl alphaonly d alpha is made from natural sources such as soya your body prefers all natural vitamin e to promote immune cardiovascular and joint health zipvits vitamin e range is all natural vitamin e d vitamin e is an anti oxidant that protects cell membranes a