<<Disclaimer: Verify this information before applying it to your situation.>> Several people responded to my query last month about Belle Color hair coloring (has wheat oil in it and I got a migraine within 2 hours of using it). Many said they get some kind of reaction from all different kinds of topical products (shampoos, colorings, permanents) that have gluten and since there are GF hair colors (L'Oreal's Preference is one), we should use them. I heard from the one listmember who had written about Belle Color a while ago, and she said her reaction was definitely from some food she had eaten that day. She has used Belle Color many times since, with no problem. I decided not to use it again myself. I don't want to take a chance with the exposure (even if it was circumstantial) and a month after using the product, my hair is like straw if I don't use a conditioner. I have not had this happen with other colorings (like L'Oreal). Anne Washburn North Carolina