HomeCommon food allergensMustard


Learn about mustard allergy, including possible sources of mustard, how to avoid mustard, and what you can do to be allergy-aware

Various forms of mustard.
Quick facts
  • Mustard is considered a priority food allergen by Health Canada. Priority food allergens are the foods that cause the majority of allergic reactions.
  • Mustard is a plant and belongs to the Brassicaceae family which also includes broccoli, canola, cauliflower, cabbage, Brussel sprouts, and turnip. Since these plants are closely related to mustard, their seeds contain proteins that are very similar to the proteins in mustard seeds. People with mustard allergy should avoid consuming the seeds and sprouted seeds of other members of the Brassicaceae family as these are more likely to trigger an adverse reaction.
  • Canola oil can be made using both canola seed and canola-quality mustard seed. Historically, the only product of canola that is commonly used in food is canola oil, which is normally highly refined and does not contain any appreciable amounts of protein. Because of this, canola oil is not considered to pose a risk for people with mustard allergy.
  • While highly refined canola oils are not considered to pose a risk for people with mustard allergy, cold-pressed canola oil is less refined, can contain residual protein and should be avoided by individuals with mustard allergy.
  • In some countries, edible oils obtained from the seeds of certain varieties of Brassica napus and Brassica rapa may be sold as rapeseed oil. While highly refined rapeseed oil is not expected to contain any appreciable amounts of protein, cold-pressed rapeseed oil may contain residual protein and therefore should be avoided by those with a mustard allergy.
  • People with mustard allergy should not eat any food if it contains mustard or canola meal or protein, or if it contains cold-pressed canola/rapeseed oil as an ingredient.
  • Mustard is used in many cuisines, including Indian, Middle Eastern, Eastern European, and Italian dishes.

Allergic reactions to mustard

If you have an allergy to mustard, keep an epinephrine auto-injector (e.g., EpiPen®, ALLERJECT®) with you at all times. Epinephrine is the first-line treatment for severe allergic reactions (anaphylaxis).


Be allergy-aware: How to avoid mustard

  • Read ingredient labels every time you buy or eat a product. If the label indicates that a product “Contains” or “may contain” mustard, do not eat it. If you do not recognize an ingredient, if there is no ingredient list available, or if you don’t understand the language written on the packaging, avoid the product.
  • Do The Triple Check and read the label:
    • Once at the store before buying it.
    • Once when you get home and put it away.
    • Again before you serve or eat the product.
  • Always carry your epinephrine auto-injector. It’s recommend that if you do not have your auto-injector with you, that you do not eat.
  • Check with manufacturers directly if you are not sure if a product is safe for you.
  • For tips on eating out, visit our guide for dining out with food allergies.
  • Be careful when buying products from outside of Canada, since labelling rules differ from country to country and the term “spice” may include mustard.
  • Watch for cross-contamination, which is when a small amount of a food allergen (e.g., mustard) gets into another food accidentally, or when it’s present in saliva, on a surface, or on an object. This small amount of an allergen could cause an allergic reaction.

Types of mustard

  • Mustard seeds - white, yellow and brown
  • Mustard Powder
  • Prepared Mustard
  • Mustard greens

Possible sources of mustard

  • Chips and pretzels
  • Fish sauce and fish paste
  • Pickles and piccalilli
  • Potato salad
  • Processed meats and deli meat
  • Salad dressing
  • Salads and steamed greens
  • Sauces:
    • Barbecue
    • Chutnies
    • Curry
    • Cumberland
    • Ketchup, tomato sauces
    • Béarnaises
    • Mayonnaises
    • Pesto
    • Vinaigrettes
    • Gravies, Marinades
  • Sausage
  • Seasonings and flavouring agents
  • Soups, stock
  • Water binding agents
  • Emulsifiers

Note: This list is not complete and may change. 


Report a reaction

If you believe you may have reacted to an allergen not listed on the packaging, you can report it to the Canadian Food Inspection Agency, which may issue a product recall. Find out more on our Food Labelling page.