Genistein is an isoflavone found mainly in soybeans. It belongs to a class of compounds called phytoestrogens, which can mildly mimic estrogen in the body.
Women often take it to support bone density after menopause and to ease hot flashes. Some evidence points to potential cardiovascular benefits as well.
You can find it in capsule or tablet form. Absorption differs between the aglycone and glycoside forms, so the right dose depends on the supplement type. Most people take it with a meal.
Watch out for interactions with blood thinners and thyroid drugs. Anyone pregnant or breastfeeding should skip it unless a doctor says otherwise. A healthcare provider should weigh in first if you have a hormone-sensitive condition.