Neosporin in Gluten-Free Foods, Products, Shopping & Medications Posted October 19, 2012 · Report to Admin I am one of those people who is allergic the Neosiporin. I found out years before my celiac diagnosis. I am allergic to neomyicinsulfate and I get a severe reaction no matter where I put it. Does not even have to be an open sore. There are other first aid creams with the same ingredient so I have to be careful. Just another thing I have to watch out for.