The vast majority of supplements containing vitamin E contain soy as the primary source of vitamin E. The well-known American surgeon, the creator of the world-famous brand Mercola, was looking for an alternative solution to his vitamin E supplement, so that it did not contain soy. He wanted not only to avoid soy, but also to be sure that vitamin E was of natural origin and not genetically modified. He opted for sunflower seeds as a rich and natural source of vitamin E.