Natural Factors Soy Isoflavone - Soy contains phytochemicals that can effectively reduce heart disease and severe and frequent menopausal symptoms, such as hot flashes and night sweats. Soy isoflavones also help to reduce bone mineral density loss in post-menopausal, in conjunction with calcium and vitamin D. Soy Isoflavone complex capsules contain naturally balanced isoflavones, genistein and daidzein. These well-known flavonoids are complemented by other healthful natural compounds found in soybeans and soy foods. Although especially popular with women, soy isoflavones have also been shown to have benefits for men.