I did wonder this, but can't find very much about it. I can just avoid gluten free bread that looks like it has powder on the top, but if it does that to my lips I am just worried if it's upsetting my tummy too.

Could it be something (some additive or other) they added to the rice flour to make it easier to work with or cook?

My lips actually have an allergic reaction.  Apparently it's rice flour ontop of the bread, but I don't have a problem with rice. I can't have gluten

@gurgi I would look at the ingredients and go through that list to see if an allergic reaction is possible. Regarding m and s soft rolls: I did a search on the ingredients of the gluten free version. It has added B vitamins (b2, b5, and b6). I also see that niacin (b3) was added. Sometimes when people take b3 or, really, too much of it, they get a flush. Again, go through the ingredients, try to figure out what constitutes that powder on the tops of the breads, and see if it could be causing a reaction.

@lydialoo, Tell me about your high dose Thiamine routine. What kind of Thiamine are you taking?  How much (mg) are you taking?  When do you take it? Are you taking a B Complex?   Are you taking Magnesium?