Xianfeng Daogu: It works on human bones, but it does not mean to add calcium. As we all know that simply replenishing calcium will lead to kidney stones or gallbladder stones. This product, however, helps us to absorb the calcium from daily food naturally, and also lock the calcium existing in our body against running off, acting as the calcium guard. Moreover, it cures a diversity of bone diseases like osteoporosis, rheumatoid arthritis, proplapse of lumbar intervertebral disc, bone cancer, bone tuberculosis, Femur Head Necrosis, etc. It acts on human bones, muscles, ligament, nerves. Apart from this, it also has another great function, pain-easing, for instance, as we all know, cancer victims at late advanced stage all suffer from great pain, even dolandin can not stop the pain. But this product can stop the pain, so the victim would pass away in serenity without any painful look.