Many food colorings are NOT safe for those with celiac and nut allergies. It appears to me that McCormick is.  I checked their website and it said that any product that contains a gluten free label is produced on a dedicated gluten free line and has been validated as gluten free.  McCormick says if gluten appears in a product, they will always list it on a label. They will never hide allergens under the term “natural flavors.”  I even called the company. The statement said, if a product ever contained an allergen it would be declared on the label. If it is not declared, this means the product does not contain it.  I feel very confident in using McCormick products due to these procedures they have in place, but of course you need to make your own decisions. You can also use plant based natural food colorings but keep in mind it won't be as deep a color as mine are.