Isolated Soy Protein

Isolated soy protein is a highly refined form of soy protein, made from defatted soybean flakes. The flakes are processed to remove most of the fats and carbohydrates, leaving a product that is at least 90% protein on a moisture-free basis. It is commonly available as a powder.

Manufacturers add isolated soy protein to foods to boost protein content, improve texture, and act as an emulsifier or binder. It is frequently found in vegetarian and vegan meat alternatives, protein bars, nutritional shakes, and some processed soups and baked goods.

Isolated soy protein is generally recognized as safe (GRAS) by the FDA for use in foods. Some research suggests potential health benefits, while other studies raise questions about its impact on hormones, though evidence is mixed and often based on animal studies or very high intake levels. JECFA has evaluated soy protein and has not set a numeric acceptable daily intake (ADI not specified), indicating it is considered safe at levels typically consumed in food.