Calcium supplementation is generally one to three months is a course of treatment, but with individual variability, the effect may vary. Calcium is one of the essential elements of the human body, calcium deficiency can easily lead to osteoporosis, joint pain, tooth loss, easy to fracture, rickets and other symptoms, need to actively supplement calcium. However, calcium tablets should not be taken for a long period of time. Long-term calcium supplementation will lead to deposition and the formation of stones, constipation, induced stroke and so on. It is generally recommended to take them for a maximum of three months, and the calcium level needs to be checked. For younger children, the calcium supplementation course is usually half a month to one month. Children in puberty will take calcium supplements for a longer period of time because of pubertal growth, usually no more than three months. Adults need calcium supplements less often, and the duration is usually no more than one month. Elderly people need to take proper calcium supplements because their bodies are degenerating, and generally take two to three months as a course of treatment. It is recommended to take calcium supplements under the guidance of a doctor to avoid the adverse effects of blind calcium supplementation.