A company response from a consumer inquiry states: ""our Shaving Gels, Lotions and Hair Crèmes contain xanthan gum derived from non-GMO corn, and our Castile Liquid Soaps, Castile Bar Soaps, Pump Soaps, and Shaving Gels contain citric acid derived from non-GMO corn"
If you're at all contact senstive (and most corn allergic's are when it comes to shower/soap products) please discontinue using Dr. Bronners.