If you have a shellfish allergy, you’ll want to avoid the types of shellfish you are allergic to. Also, be mindful that most people who have an allergy to one type of shellfish may also have an allergy to other types.

To avoid accidentally ingesting shellfish, be sure to read the ingredient lists on all foods, cosmetics, and medications when you shop. Manufacturers occasionally change their product recipes, so check the ingredient list each time you buy a product.

This article reviews medications and supplements you’ll want to be especially careful about purchasing. Remember, you can always ask your doctor for help, as they can recommend shellfish-free substitutes.

Certain medications can contain extracts from the shells or skeletons of shellfish, which can induce an allergic reaction. These include:

  • Glucosamine: Some glucosamine supplements, which are used for arthritis, may contain skeletons of shellfish. You can opt for shellfish-free glucosamine, such as chondroitin, which does not include shellfish.
  • Chitin: Chitin is a natural biopolymer found in the hard outer shell of shellfish and certain insects. It may be included in some weight loss supplements and moisturizers. Be sure to avoid products listing chitin as an ingredient.
  • Calcium supplements: Calcium supplements may contain ground oyster shells, so be sure to examine the ingredient list before using them.
  • Fish oil: While fish oil supplements do not contain shellfish protein, molecular traces of these proteins may still be found in fish oil, which could potentially trigger an allergic reaction.

It’s important to discuss any type of allergy you have with a doctor, especially if they’re preparing to prescribe you a medication. A doctor can help determine what medications and supplements are safe for you to use.

Symptoms of a shellfish allergy include:

  • indigestion
  • stomach cramps
  • vomiting
  • diarrhea
  • shortness of breath, difficulty breathing
  • persistent cough
  • tightness in throat
  • weak pulse
  • pale or blue coloring of the skin
  • hives
  • swelling of the tongue or lips
  • dizziness
  • confusion

Shellfish allergies can cause anaphylaxis

Anaphylaxis is a severe and potentially life threatening allergic reaction. If you have had a severe allergic reaction to shellfish, talk with your doctor about an epinephrine auto-injector (EpiPen). They can give you a prescription in advance and explain how and when to use it.