What are some sulfur allergy symptoms? | HowStuffWorks
Food allergies occur when the immune system identifies the proteins in a particular food as harmful to the body, subsequently reacting to try to "fight off" the "harmful" proteins (which are in fact harmless). It is unlikely that you would have an allergy to sulfur, which is found in nature. In fact, the term "sulfur (or sulfa) allergy" should be avoided because it is confusing.