Hidden soy on food labels, other names for soya

Updated 29 October 2026 · By IngrediLens

Soya is everywhere in processed food. It is used as a protein, an emulsifier, an oil, a flavour base and a meat substitute. In the EU and UK it is one of the 14 allergens, and in the US it is one of the 9 major allergens. It is often hidden behind technical names or in foods that do not look like soy at all.

How soy is labelled

• EU and UK: soy must be emphasised in the ingredients list: "emulsifier (soya lecithin)", "hydrolysed soya protein".
• US: soy must be named in the ingredient list ("lecithin (soy)") or in the "Contains" statement.

The words "soy" and "soya" mean the same thing. UK labels usually say soya, US labels say soy.

Names that mean soy

Whole and fermented soy foods:

• soybean, soya bean, edamame, black soybeans, kinako (roasted soy flour)
• tofu, tempeh, natto, yuba (tofu skin), okara (soy pulp)
• miso, shoyu, tamari, soy sauce, teriyaki sauce, doenjang, gochujang (often contains soy)
• soy milk, soya drink, soy yogurt, soy cheese

Ingredients made from soy:

• soy lecithin (lecithins, E322, when from soy)
• soy protein, soy protein isolate or concentrate, soy flour, soy grits
• textured vegetable protein (TVP), textured soy protein, soy mince
• hydrolysed soy protein, hydrolysed vegetable protein (check the source)
• soybean oil (unrefined) and soy "butter"
• mixed tocopherols (E306) and plant sterols, which can be soy-derived (exempt in the EU when refined)

Foods where soy often hides

• Bread, biscuits and cakes (soy flour and lecithin improve texture)
• Chocolate and sweets (soy lecithin as an emulsifier)
• Processed meats: sausages, burgers, ham and nuggets often use soy protein as a binder
• Meat substitutes and many vegan products
• Sauces and stock cubes, especially Asian-style sauces, gravies and marinades
• Protein bars and shakes, infant formula (soy-based), cereal bars
• Tinned tuna in vegetable broth, some soups and ready meals
• Restaurant cooking: deep-fat fryers may use soybean oil, and many Asian dishes contain soy sauce or miso

Exemptions: refined soy ingredients

EU law exempts a few soy derivatives because processing removes almost all of the protein. They do not have to be emphasised:

• fully refined soybean oil and fat
• natural mixed tocopherols (E306), natural D-alpha tocopherol and related forms from soy
• vegetable oil-derived phytosterols and plant stanol esters from soy

In the US, highly refined oils are exempt from FALCPA allergen labelling. If you react to very small amounts, ask your allergist whether these matter for you.

Soy and other legumes

Soy is a legume, like peanuts, peas, lentils, chickpeas and lupin. Being allergic to one legume does not automatically mean you are allergic to the others, but some people do react to more than one. Pea protein and lupin flour are increasingly used in "free-from" and vegan products. Ask your allergist which legumes you need to avoid. Lupin is covered in the overlooked allergens, and peanuts in hidden nut names.

Soy in cosmetics

Soy appears on INCI ingredient lists as Glycine Soja (soybean oil, protein or extract) and Hydrolyzed Soy Protein. It is common in hair care and moisturisers. See reading cosmetic INCI lists.

How IngrediLens helps

Turn on a soy filter in IngrediLens and the app highlights soya, soy lecithin, edamame, miso, TVP and other names on food labels. It also finds Glycine Soja on cosmetics and flags "may contain soy" statements. Because soy is so common, the camera view helps you check many products quickly in the supermarket. Labels are the final word, and the app can miss small print, so always confirm on the pack.