I have osteoporosis. For over 2 years I spent a lot of money on what I thought was superior calcium from the health food store. Each bottle cost over $30.00. I have a new doctor and he told me it was not necessary to spend so much money. I have taken Twin Lab calcium for almost a year and my recent blood work indicated that this calcium is being absorbed excellently in my body. This calcium is a very good value, easily and effectively absorbed. Why overspend?