Pea Protein Allergy: Symptoms and Causes


While pea protein allergies are not quite as common as peanut allergies (which is also a legume), they do exist and are becoming more common.

Pea protein is a relatively cheap protein ingredient that is also friendly to vegetarian diets. Its use has dramatically risen in recent years.

Similar to other allergens, symptoms start to show when a certain threshold of exposure is met. So as more people consume a larger amount of pea protein in their diets, we will see more people realizing that they are allergic to it.

Symptoms of Pea Protein Allergies

Allergy symptoms vary based on the person and the specific allergen.

Someone who has both peanut and pea protein allergies may not have the exact same response to each allergen.

In general, the common responses to a food allergy like pea protein include:

  • Runny noses and sneezing
  • Facial swelling and pain
  • Coughing and breathing trouble
  • Itchy skin (hives)
  • Stomach problems
  • Feeling generally sick

The most serious symptom of an allergic response is anaphylaxis, which is mostly caused by swelling in the mouth or throat area that can stop breathing. It requires immediate medical intervention and is often fatal if not treated.

Can pea protein cause anaphylaxis? Just about any food-related allergy can cause anaphylaxis, including pea protein.

When to See a Doctor About a Potential Pea Protein Allergy

Because allergies can potentially be life threatening, anyone suspecting a pea protein allergy should see a doctor as soon as possible.

If symptoms include trouble breathing and potential anaphylactic shock, then immediate care at an emergency room should be sought.


Just because a pea protein may involve minor symptoms when someone first notices it, doesn’t mean that it couldn’t be life threatening at a later time in life. It’s important to confirm it so that you can plan your life around it.

Causes of Allergic Response

Allergic responses to food are caused by a reaction to certain protein molecules in them. Your immune system classifies specific proteins as harmful, and produces an immune response.

Pea protein and peanuts are both legumes and share many proteins, so many people are allergic to both peas and peanuts.

While pea protein doesn’t have as many proteins that have been identified as potential allergens as peanut protein, pea protein still contains some potential allergenic proteins.

In a 2021 review of pea protein literature, the most important note is that peas lack any 2S albumin proteins, which are the most potent allergens in peanuts. This helps explain why pea protein allergies aren’t quite as common or severe.

Still though, research has shown that peas contain certains proteins like Pis s 1 (a vicilin protein) and Pis s 2 (a convicilin) protein, which can trigger allergic responses.

The vast majority of pea protein exposure comes from consumption, rather than touching or smelling, just because it’s not common to have peas or pea protein sitting around.

How to Diagnose a Pea Protein Allergy

There are 2 main ways used to diagnose pea protein allergies.

The first category is through skin prick testing or blood testing.

Skin prick testing involves putting known allergens on skin, and then the skin is pricked and compared to a control substance. A different reaction indicates an allergy.

An allergy blood test isn’t available for all potential allergens, but is available for pea protein these days. It involves measuring the amount of antigens for pea protein to diagnose an allergy.

Finally, allergies can be diagnosed through a food challenge. These can be conducted in different ways, but generally involve eliminating the potential allergen (pea protein in this case) and re-introducing it in gradually increasing amounts. This requires medical supervision, so it can be time consuming and expensive.


Pea protein allergies can be identified by skin prick tests, blood tests, or food challenges. Medical guidance will be needed in any case.

Which Foods With Pea Protein To Avoid?

now sport pea protein

If someone suspects they have a pea protein allergy, they’ll of course want to avoid pea protein powder, which is used in most plant-based protein powders.

However, pea protein is also being used in a growing number of other food products.

In addition, it may be used as a sub-ingredient, and may not be included on the ingredients label because it’s not a priority allergen like peanuts that requires specific labeling in most countries.

In general, foods that may include pea protein as an ingredient include:

  • Processed meat products (sausages, sliced deli meats, etc.)
  • Plant-based meat alternatives (e.g. Beyond Burgers)
  • Milk and dairy alternatives
  • Soups
  • Sauces
  • Cereals
  • Premade baking mixes
  • Gluten-free foods

It seems that the popularity of pea protein as an ingredient is only rising, so someone with a pea protein allergy needs to be vigilant about checking ingredient labels and contacting manufacturers if there’s a chance that it’s an unlabeled sub-ingredient.

About the author

Dale Cudmore

Your friendly neighborhood vegan from Toronto. I've spent over 6 years as a freelance nutrition writer and researcher. During this time, I've tested over 50 vegan protein powders, and over 100 other types of vegan supplements.

Add comment