Osteoblasts

Are cells that lay down the protein matrix that becomes bone after mineralization (adding calcium and other minerals) under the influence of Vitamin D. Osteoblast cells form new bone (“bone formation”) in the normal process of bone renewal called “remodeling.” Formation occurs rapidly during growth in adolescence. It also occurs more rapidly than usual under the influence of progesterone during the luteal phase of the menstrual cycle or from therapy with progesterone, most progestins or parathyroid hormone (which is experimental).