I've only been in this location once, for ice cream. UPDATE: My gf brother ate here after they started carrying gf Udis buns. He's young and male so I didn't get a whole lot of detail from him. His bun came in a sealed package, which he had to open and then assemble his burger. (see this link for a picture, description, nutrition, and ingredients: http://www.culvers.com/menu-and-nutrition/butterburgers/menu-item-details/gluten-free-bun/ ) The allergy grid on their website says the gf buns have eggs. There is risk for cross contamination as "Culver’s ground beef does not contain gluten or wheat; however it is cooked on a grill with breads." The fryer is shared with allergens as well.