Adhering to the "principle of what is lacking", today we talk about how to supplement calcium. So, how do we know if we are short of calcium? Calcium deficiency mainly has the following manifestations: joint pain, back pain, leg pain, osteoporosis, easy cramps, easy fractures, and unsteady posture. If you have any of the above symptoms, you should pay attention to calcium supplementation. The calcium plus vitamin D3 soft capsules produced by Guangzhou Changsheng Kang Biotechnology Co., Ltd. can not only supplement calcium, but also supplement vitamins. It is a double benefit!