Taking 6 months, bone density from "T = -1.8 bone mass reduction", to "T = 0.3 bone normal." Short time effect is very obvious. Talk about why I chose this. 1) first calcium must choose the fourth generation of calcium, plant calcium. Although expensive but high absorption rate, will not lead to stones. 2) to enhance the bone network, in addition to calcium, but also add magnesium, VD, trace minerals. Must be fully fill, this is included. 3) The brand is the most cost-effective. Nature of the plant calcium I also tried. Ingredients the same. Expensive. MRM this brand of Chinese people can hear, but it is actually a fitness brand of health care products.