Simplify the following text for a Grade 9 native English-speaking person.
Original: Xanthan gum may be derived from a variety of source products that are themselves common allergens , such as corn , wheat , dairy , or soy .
Simplified: Coeliac disease sufferers and other people who are sensitive to gluten and other allergens may need to be careful how much xanthan gum is in their food . Some types of xanthan gum are made with wheat , corn or soy and could cause allergic reactions .