Isoflavones are a type of naturally occurring isoflavonoids, which are substituted derivatives of isoflavone. They are produced almost exclusively by the members of the bean family, Fabaceae (Leguminosae) . Isoflavones are also known as phytoestrogens because they have a similar structure to estrogen and can act as weak estrogen in the body. Some studies have identified potential health benefits from isoflavones, such as chemoprotective effects for several cancer types, including breast cancer and prostate cancer, cardiovascular diseases, osteoporosis, or menopausal symptoms. Isoflavones are also known to exhibit antioxidant, anticancer, antimicrobial, and anti-inflammatory properties. However, there is little scientific evidence for either the safety of long-term supplementation or of health benefits from these compounds. Some studies have identified potential risks from high intake of isoflavones, such as in women with a history of breast cancer, but this concern has not been substantiated with high-quality clinical research. Isoflavones are found in legumes, particularly soybeans, as glycosides, i.e., bound to a sugar molecule.