Calcitriol is a man-made active form of vitamin D. Most people get enough vitamin D from exposure to the sun and from fortified food products (e.g., dairy products, vitamins). Vitamin D helps control parathyroid hormone and the levels of certain minerals (e.g., calcium, phosphorus) that are needed for building and keeping strong bones. Elemental calcium is used as a calcium supplement for body which is a key ingredient for formation and maintenance of bone mass. Soy isoflavones are naturaly present in the soy bean. Isoflavones, seems to reduce the risk of fibroids and endometriosis.