Sulphites
Sulphites are compounds that are used as an additive in foods to preserve shelf life and prevent bacterial/fungal growth. You can find them in wine, ciders, vinegar, processed meats, and more.
Allergic reactions to sulphites don’t occur that often. However, a lot of men and women are sensitive to sulphites, particularly asthmatics. The release of sulphur dioxide causes airway constriction.