Estrone is a type of estrogen, which is a group of hormones important for sexual and reproductive development. It is primarily produced in the ovaries, but can also be made in fat tissue and the adrenal glands. Estrone plays a crucial role in regulating the menstrual cycle and maintaining reproductive health in women. In addition to its role in female physiology, estrone is also present in men, although in lower amounts. It is involved in various bodily functions, including bone health and fat distribution. Abnormal levels of estrone can be linked to health issues, such as menopause symptoms or certain types of cancer.