Because the human body can absorb single ionized calcium, many calcium tablets on the market are compound calcium, especially calcium combined with phosphorus, which cannot be absorbed by the human body.
Milk has a high calcium content, which is a good way to supplement calcium. You can drink more milk every day (young people can drink half a catty in the morning, noon and evening), and there should be no problem in diversifying your diet. Do not drink strong tea or coffee within 2.5 ~ 3 hours after calcium supplementation, so as not to affect the absorption of calcium. Usually you can eat more foods with high calcium content such as tofu and kelp.
When people are 0 ~ 20 years old, it is the best time to supplement calcium. The role of calcium supplementation in this period will play an important role in the calcium needed in life. At the age of 20 ~ 35, calcium production is the peak in a person's life. After the age of 35, the calcium in the body will be gradually consumed until osteoporosis in the elderly. Therefore, before the age of 20, you should pay attention to calcium supplementation. If you miss it, you can't make it back.