<<Disclaimer: Verify this information before applying it to your situation.>> Below is a letter from Subway telling me the mayo is GF. Also for those who would like to see a more complete list of Gf products at Subway visit this link on our Naples Florida Support Page. http://www.geocities.com/naplesceliacs/subway.htm take care, Heather Doria Dear Heather, In response to your request, here is a complete ingredient listing for our mayonnaise: LIGHT MAYONNAISE DRESSING Water, soybean oil, modified food starch (derived from corn), egg yolks, vinegar, contains less than 2% of: salt, eggs, mustard flour, phosphoric acid, alpha-tocopheryl acetate (Vitamin E) with potassium sorbate, calcium disodium EDTA as a preservative, artificial flavor, oleoresin of paprika, beta carotene (color), phylloquinone. Sincerely, Betsy Nuttall SUBWAY Customer Service Representative [log in to unmask] (800)888-4848