Medically reviewed on August 1, 2022 by Amy Harris, MS, RN, CNM. To give you technically accurate, evidence-based information, content published on the Everlywell blog is reviewed by credentialed professionals with expertise in medical and bioscience fields.
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Soy can be a delicious and healthy part of nutritious diets. It’s an excellent source of plant-based protein and many other nutrients. But if you think soy could be causing an allergic reaction, testing for a soy allergy is one way to get answers to your questions about your symptoms.
Soy allergies are among the most common food allergies.  Typically, they appear in childhood. Some people outgrow a soy allergy by the time they reach adulthood. However, soy doesn’t affect everyone the same way. Some people have trouble digesting soy. Others actually have an allergy that prevents them from consuming soy and soy-based products.
Luckily, you can do initial testing for a soy allergy from the comfort of your home. Keep reading to learn more about soy allergies and how to test for soy allergy at home.
An allergic reaction to soy can occur when your immune system thinks that the proteins in soy are enemies. Your immune system then creates antibodies that bind with specific proteins in soy. These antibodies are known as immunoglobulin E or IgE.
When the soy proteins bind with the IgE, it triggers your immune system to fight back.  Because soy is a member of the legume family, you might also experience an allergic reaction to other legumes, including:
Your immune system produces histamine and releases other chemicals. This causes you to have an allergic reaction.
Because soy is a member of the legume family, you might also experience an allergic reaction to other legumes, including: 
The most common allergy pairing with soy tends to be peanuts, as these two legumes share many similar proteins. So be sure to check what causes peanut allergy as well.
If you’re allergic to soy, you’ll want to understand that soy is present in many products, even those you wouldn’t expect. Outside of soybeans, soy sauce, and tofu, you might find soy in: 
If you’re allergic, you’ll need to carefully read the food labels to find the soy in some processed foods. Soy can even be used as an ingredient in some soaps and moisturizers.
If you are allergic to soy, you’ll notice certain allergic symptoms whenever you’re exposed to soy or products containing soy. Just like shellfish allergy symptoms, some common reactions or symptoms associated with soy intolerance or allergies include: 
Although severe, life-threatening allergic reactions are rare in soy intolerance or allergies, they can occur.  Anaphylaxis is a serious allergic reaction that requires immediate medical attention. Those suffering from a severe reaction like anaphylaxis may experience difficulty breathing, rapid or reduced heart rate, dizziness, vomiting, and other serious allergy symptoms.
If you experience a severe allergic reaction to soy, you should seek medical attention right away. However, mild or moderate allergic reactions might allow you to take charge of the initial screening on your own.
There are several ways to test for a soy allergy, including: 
If you opt to begin with a blood test, you’ll be happy to know you can do so without leaving your home. Here is how to collect your sample:
If you’re experiencing a reaction to soy, you’re not the only one. As one of the most common food allergies, soy is an ingredient many people need to avoid. Fortunately, however, this means you’re likely to find plenty of soy-free alternatives at your grocery store.
With any allergy, however, the first step is to become aware.
If you want to safely test for a soy allergy in the comfort of your own home, we can help. The Everlywell Food Allergy Test screens for some of the most common food allergies, including soy. It’s a simple finger prick test that measures your body’s reactivity to soy. If the test shows that you have a reaction to any of the foods screened for, we’ll put you in contact with a nurse to discuss your next steps.
Try our hassle-free option to test for a soy allergy today.