I watched a show recently about how popular a Gluten-Free diet is now and all the products that are available, I believe it was Marketplace.  They mentioned shampoo and that it shouldn’t cause a problem for those who are gluten-free.  Well, I disagree with that remark.  Not long after I became gluten-free, I was feeling very good, no nausea, diarrhea, etc.  All of a sudden I started feeling a lot of nausea again.  I was puzzled because I knew I had not eaten any gluten.  I started checking and rechecking labels on everything I ate.  I started thinking about any new products I had started using lately.  Having just changed my shampoo, I decided to check the label … sure enough, it had WHEAT.  I stopped using it right away and in a couple days I was again nausea-free.  That, for me, was a confirmation that gluten in shampoo can affect a Celiac.  I don’t know how it does, but it does and no one can convince me that it doesn’t because I experienced it.  Heck, just breathing in flour when baking something for my husband caused me to be sick and I was very careful to not let the flour fly around, I believe I had even used a mask.  So, my advice, don’t take a chance on using shampoo with gluten.  😀