Posted in Web Soy Allergy: Foods It May Be In, Other Names and Tips to … January 19, 2021 A soy allergy is when your body reacts to soy protein. Soy protein is a product of soybeans and it’s in many foods. If you are allergic to soy, your immune system will react anytime you come in… https://www.webmd.com/allergies/soy-allergy