What has gluten in it?
Gluten
Besides gluten, additional components present in wheat, rye, barley, oats, and their derivatives, including other proteins called ATIs and short-chain carbohydrates known as FODMAPs, may cause NCGS symptoms.[47] The effects of FODMAPs are only limited to gastrointestinal mild discomfort.[47] ATIs may  cause toll-like receptor 4 (TLR4)-mediated intestinal inflammation in humans.[55][56]