Numerous studies and publications suggest that soy isoflavones are among the dietary factors affording protection against menopausal symptoms, osteoporosis, heart problems, cancer and more. However, saponins found in soybeans are now thought by many researchers to have important synergistic functions with isoflavones.Saponins are widely distributed in the plant kingdom. Soybeans, as a major source, have a saponin content of five to six percent by weight. In one commercial product, it can be as high as 44 percent in a 40 percent soy isoflavone. Saponins are amphiphilic compounds composed of a lipid-soluble steroid moiety attached to a water soluble glycosidic chain.
Recent scientific research indicates that saponins have even more positive health benefits than first realized.