Soybean products believed to have medicinal properties and the ability to prevent certain diseases. Soy isoflavones, naturally occurring plant chemicals found in soy, have mild estrogen like effects and are taken by many women to relieve symptoms of menopause, such as hot flashes. Soy isoflavones are also thought by some people to have the ability to prevent hormone-related cancers, such as breast and prostate cancer. There are no definitive studies to verify these claims.