Ingredient

Soy Protein Isolate

Source
Not animal-derived
Allergen
No
Role in food
Manufacturers add soy protein isolate to foods primarily to boost their protein content. It …

What is Soy Protein Isolate?

Soy protein isolate is a highly refined form of protein made from soybeans. It is produced by removing most of the fats and carbohydrates from defatted soybean flakes, resulting in a product that is at least 90% protein.

Is Soy Protein Isolate vegan?

Soy Protein Isolate is not animal-derived. Products that contain it can still include other animal-derived ingredients, so check the full ingredient list.

Is Soy Protein Isolate a major allergen?

Soy is one of the nine major food allergens identified by the FDA.

What is Soy Protein Isolate used for?

Manufacturers add soy protein isolate to foods primarily to boost their protein content.

Is Soy Protein Isolate safe?

Soy protein isolate is generally recognized as safe (GRAS) by the U.S. Food and Drug Administration (FDA).

Why it's used

Manufacturers add soy protein isolate to foods primarily to boost their protein content. It is often found in protein bars, breakfast cereals, meat alternatives, and nutritional shakes, where it can also help improve texture.

Health notes

Soy protein isolate is generally recognized as safe (GRAS) by the U.S. Food and Drug Administration (FDA). JECFA has evaluated soy protein products, and EFSA has also assessed soy protein. While some discussions exist regarding phytoestrogens in soy, current scientific evidence generally supports its safety at typical consumption levels for healthy individuals.

Allergen info

Soy is one of the nine major food allergens identified by the FDA.

Foods that contain Soy Protein Isolate

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Last updated: September 28, 2026

Note: This site presents label data from USDA FoodData Central for general information. It is not medical advice. Check the package label; formulations change.