I know this is an older post, but I wanted to share the information I have gathered on vitamin E. I'm super allergic to soy, and can't tolerate anything made from soy, or anything that has even touched soy. There a lots of brands I can't eat anything of because I know their manufacturing process taints what would otherwise be a soy free food. (Frito Lay, and the Envirokidz are the two that come to mind.) I've spoke to a Frito Lay representative and she confirmed the product that I ate should have been safe for me, but it was manufactured on the same equipment that also processes food containing soy. However, she was assured me that the equipment is fully washed to all government specifications in between batches. Right, that's why I got sick.
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Anyways, back to vitamin E. Synthetic Vitamin E is indicated by the dl-alpha prefix (as in dl-alpha-Tocopheryl acetate.) I'm not sure I would want to take large amount of it, as it's derived from petroleum products. Yuck.
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Natural forms of vitamin e drop the L, becoming just d-alpha forms. There are many plant sources of E, not just soy. It's only because soy is the cheapest, and readily available that it's the most commonly used source. (It's the same with Lecithin. Unless it specifies sunflower, egg, or some source I will not eat anything with lecithin.)
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There is also a newer form of natural "dry" vitamin E which is commonly advertised as soy free. However, this is completely false because it starts with soy oil just like all most all natural vit E. Because of the drying method most of the soy proteins are removed, thus considered free from allergens. I know this is not safe for me, and I haven't gambled with any of it.
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I think the best solution is to find a product with a natural vitamin e, and ask the manufacture to specify it's source. Easier said than done. Many times they claim a mixed source, and not just one. I couldn't find any prenatal vitamins that I could take with my last pregnancy in 2008. I took a lot of grief from nurses about that, but my Dr said it was perfectly fine. I did take calcium, folic acid, and a DHA/omega 3 & 6 supplements.
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A good source to start with: http://en.wikipedia.org/wiki/Tocopherol