Hello @brian1 I'm a UK based Moderator here on the forum.  If you are British, you may find that in your region you might be able to get certain gluten-free food (usually staples like bread) on prescription.  I recommend you ring Coeliac UK for the most up-to-date advice on this. https://www.coeliac.org.uk/home/ There is some advice here for UK coeliacs which might also be of use, on how to best navigate the gluten-free diet on a budget. https://www.coeliac.org.uk/information-and-support/living-gluten-free/the-gluten-free-diet/gluten-free-diet-on-a-budget/ I am afraid I don't know anything about the benefits you mention but maybe the charity can help? Cristiana  

Legumes can be a source of wheat contamination, but I assume that you use versions labelled "gluten-free."

You may want to look into Benfotiamine, which is the fat soluble version of B1.

Be sure all testing is completed before going gluten-free, that is, unless you are certain that gluten is the culprit and have decided not to eat it again. This article has some detailed information on how to be 100% gluten-free, so it may be helpful (be sure to also read the comments section.):    

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