Sulfate vs. Sulfa Allergy: Understanding the Differences

Allergies affect millions of people every day. Many have allergies to compounds related to sulfur, but each allergy is very different.

About Allergies

• Someone with allergies has an overactive or oversensitive immune response to certain allergens. The immune system attacks the allergen with excessive histamines.

Sulfur

• Sulfur itself is an element, essential to life and present in the human body. No one is allergic to sulfur.

Sulfur Allergens

• Sulfur compounds serve as the basis for other compounds, such as sulfa, sulfites and sulfates. These derived compounds can serve as allergens.

Sulfate Allergies

• Sulfate is a polymer; it is made of potassium or sodium and sulfate. These do not cause allergic reactions. However, if prepared from shellfish, the shellfish could contaminate a sulfate supplement.

Sulfa Allergies

• Sulfa drugs, or sulfonamides, can attach to proteins when metabolized. This larger molecule, which is a drug-protein complex, is what causes sulfa allergies.