Calcium and zinc are both essential nutrients that are vital to the growth and intellectual development of children. There are two main methods of calcium and zinc supplementation in the market, one is calcium and zinc supplementation, and the other is calcium and zinc supplementation separately. Is it better to take calcium and zinc separately or together? Can calcium and zinc be supplemented together? How does calcium plus zinc achieve calcium and zinc supplementation? The human body is more accustomed to calcium and zinc supplementation. Breast milk or daily meals contain both calcium and zinc and other trace elements, so children are definitely taking calcium, zinc and other nutrients at the same time when they are breastfeeding or in their daily diet. Cereals, vegetables, fruits, and meat are all included in the daily diet of people, and all nutrients are absorbed at the same time at three meals a day. It is impossible to extract the zinc, calcium and iron contained in the food and eat them separately. International experts have proven that calcium and zinc do not affect each other. Spencer, H and other experts have conducted two studies on the relationship between the absorption of calcium, zinc and phosphorus. In their study entitled “The effect of calcium and phosphorus on the metabolism of zinc in humans”, they observed the effect of different daily calcium and phosphorus intakes on the metabolism of normal daily zinc intake. The results showed that calcium intake of 200 mg, 800 mg and 2000 mg had no effect on the absorption, fecal and urinary excretion and metabolic balance of normal amounts of zinc. Phosphorus intake of 800mg and 2000mg also had no effect on zinc absorption and metabolism. LonnerdalB and other experts added 1300mg of calcium to 500ml of milk and soya milk respectively to increase the calcium content and to observe whether there was any effect on the absorption of zinc after taking milk and soya milk containing high calcium. The results showed that the calcium in the high-calcium milk did not affect the absorption of zinc, while the absorption of zinc in the high-calcium soymilk was significantly higher than in the control group. A study by experts such as AAMcKenna looked at whether calcium has an effect on the metabolism and absorption of zinc. The experiment was conducted on 26 adolescent females. The test group took a high daily calcium intake of 1722 mg and a low zinc intake of 6.3 mg, and the control group took a normal calcium intake of 722 mg and a low zinc intake of 6.3 mg. RESULTS: There was no change in the absorption of zinc in either group, indicating that there was no effect of calcium on zinc absorption when normal and high doses of calcium and low doses of zinc were taken together. From the above study, it is clear that calcium not only does not affect zinc absorption, but in some cases it also promotes zinc absorption. The scientific ratio of calcium and zinc is a good way to save on the absorption of calcium and zinc. The latest foreign studies have shown that zinc and calcium have their own independent molecular carriers, and within a certain ratio, the absorption does not affect each other. Studies in humans have shown that the intake of 1000mg of calcium does not affect the intake of 14.5mg of zinc (calcium to zinc ratio 69:1), which means that calcium and zinc taken together do not interfere with each other in the usual pharmacological dose ratio. The best-selling Calcium Plus Zinc Oral Liquid is within this safe range. After repeated tests, the scientific ratio of calcium to zinc has been approved by the Ministry of Health of the People’s Republic of China, which is particularly suitable for the growth and development of Chinese children, thus enhancing the absorption of calcium and zinc. The scientific dosage of calcium and zinc will ensure that both elements are well absorbed and have a synergistic effect on each other in terms of therapeutic effects. Calcium and zinc supplementation can improve the immune function of children, enhance resistance to infection, improve functional metabolism, and promote calcium absorption in children. Zinc supplementation improves appetite while calcium supplementation promotes the recovery of the organism. From the above, it can be seen that scientifically formulated calcium plus zinc oral solution is the best choice to supplement calcium and zinc nutrients.