There is no clear-cut statement as to how old a calcium shot is appropriate for, but generally speaking, whenever there are symptoms of severe calcium deficiency, it is possible to treat them with a calcium shot, regardless of age. Calcium injections are mainly used to treat calcium deficiency, acute calcium loss and other diseases, but can also be used to treat magnesium and fluoride toxicity, allergic diseases and so on. If there is a calcium deficiency and normal calcium supplements are not effective, calcium shots can be used to quickly replenish calcium. Calcium injections can provide the body with a large, rapid dose of calcium, but should be utilized under a doctor’s supervision. Calcium injections are prone to side effects when administered intravenously, which may lead to hypercalcemia and a variety of resulting clinical disorders, such as cardiac arrhythmias and even sudden cardiac arrest. Some patients also experience fever, nausea, vomiting, dry stools, and headache. Calcium injection sites are prone to hardening, and if it accidentally leaks outside the blood vessels, it can easily lead to conditions such as severe tissue pain or even tissue necrosis. Therefore, unless it is a very serious calcium deficiency, calcium injection is generally not recommended. In normal life, diet should pay attention to nutritional balance, eat more calcium-rich foods, such as black beans, milk, shrimp and so on. To strengthen physical exercise, enhance personal fitness, promote calcium absorption.