Not all soy protein products contain the same amount of protein. The following list ranks the protein content of some common soy foods. Highest protein items are at the top of the list.
Soy protein isolate (added to many soy food products, including soy sausage patties and soybean burgers)
Soy flour
Whole soybeans
Tofu
To find out about protein content in a soy-based food:
Check the Nutrition Facts label to see the percentage of soy protein.
Also look at the list of ingredients. If a product contains isolated soy protein (or soy protein isolate), the protein content should be fairly high.
Some products also list how many grams of soy protein are in one serving of the product.
Note: There's a difference between soy supplements in the form of tablets or capsules and soy protein products. Most soy supplements are made of concentrated soy isoflavones. These substances may help relieve symptoms of menopause. However, there is not enough evidence to support soy isoflavones for other health purposes, such as lowering cholesterol.