Isoflavones are produced almost exclusively by the members of the Fabaceae (i.e., Leguminosae, or bean) family. They are reported as phytoestrogens in mammals and have special interest in dietary supplement industry, where our isoflavone standards are used. Soybean isoflavone reference material: daidzein, genistein, glycitein and their 7-glucosides continue to yield numerous studies in the domain of regulation of postmenopausal symptoms.