Not all soy protein products contain the same amount of protein. The following list ranks some popular products from greatest amount of soy protein to lowest:

• Soy protein isolate (added to many soy food products, including soy sausage patties and soybean burgers)
• Soy flour
• Whole soybeans
• Tofu

The best way to find out about protein content is to look on the product's 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 (commonly sold in tablets or capsules) and soy protein products. Soy supplements are generally made of concentrated soy isoflavones. These substances may help relieve symptoms of menopause but there is not enough evidence to support using soy isoflavones for any of the other health benefits, such as lowering cholesterol.

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Review Date: 05/03/2009
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org)