Soybean Allergen

Soybean is one of the nine major U.S. food allergens. Soy allergy is most common in infants and young children, and soy can turn up in breads, crackers, cookies and many other baked goods.

  • Food safety
  • Allergens & labeling

Soybeans are legumes, related to beans, peas, lentils and peanuts. Soy allergy is an allergic reaction to soy protein; FARE puts it at about 0.4% of U.S. children, and it usually starts early in childhood. Many children outgrow it, often by age 3 and in most cases by age 10, though some stay allergic for life. On labels, FDA accepts “soy,” “soybean” or “soya” as the allergen name. Soy can appear as edamame, miso, natto, tofu, tempeh, tamari, shoyu, soy flour, soy protein isolate and textured vegetable protein.

Soy shows up in many foods bakers use or sell, including breads, cereals, crackers, cookies, vegetable broth, vegetable gum and starch, and plant-based meat substitutes. FDA exempts highly refined soybean oil from allergen labeling, and most soy-allergic people tolerate it, but cold-pressed or expeller-pressed soy oils may contain protein. One study cited by FARE found up to 88% of soy-allergic patients were also allergic or strongly sensitized to peanut, so soy and peanut controls often go together.

Key facts

U.S. children with soy allergy
About 0.4%
Estimated Americans affected
1.9 million
When children outgrow it
Often by age 3; most by age 10
Label names FDA accepts
Soy, soybean, soya

In a bakery or commercial kitchen

  • Write “soy,” “soybean” or “soya” plainly in the ingredient list or “Contains” statement; FDA accepts all three names
  • Ask suppliers whether soybean oil is highly refined, since oils that are not highly refined must be declared as allergens
  • List highly refined soybean oil as “soybean oil” in the ingredients even though no allergen declaration is required
  • Check bread bases, shortenings, release agents and fillings on supplier specs for soy flour, soy protein or soy lecithin

For home and cottage bakers

  • Look for soy in breads, crackers, cookies, cereals and canned broths before baking for a soy-allergic guest
  • Ask whether soy lecithin and refined soy oil are okay; most people with soy allergy tolerate them, but not all
  • Remember that vegan and vegetarian meat substitutes often rely on soy for their texture

Related entries

Sources

Written by VanillaGoods in our own words from these sources. Last reviewed October 17, 2026.

  1. Soy Allergy, Food Allergy Research & Education (FARE)
  2. Questions and Answers Regarding Food Allergens, Including the Food Allergen Labeling Requirements of the Federal Food, Drug, and Cosmetic Act (Edition 5): Guidance for Industry, U.S. Food and Drug Administration
  3. Facts and Statistics, Food Allergy Research & Education (FARE)