The peak calcium content of human bones is around the age of 35, when at the peak of bone density. The amount of bone in our body at this time is called peak bone. It is the period of time when the amount of calcium in the body is at its peak in this lifetime that is called peak bone. The higher the peak bone value, the lower the probability of osteoporosis in our old age. The most important age groups for calcium supplementation are infancy, childhood and adolescence; and old age. Calcium supplements should also be taken in moderation and not blindly abused. If over-emphasis on calcium supplementation, calcium intake is too high such as more than 4 grams per day, and the duration is too long, there may be side effects, but instead of affecting health, causing constipation, hypercalcemia and other adverse reactions. It is necessary to take calcium supplements scientifically under the guidance of a doctor.