Calcium citrate tablet is a good calcium supplement product. Many people think that the side effects of calcium citrate tablets do not exist. In fact, even the best nutritional supplements will have some side effects. Especially, many people with allergies will have symptoms of constipation, nausea and vomiting when using calcium citrate tablets. If this symptom is serious, it is recommended to stop using it. For many serious people, after using calcium citrate tablets, they may have symptoms of dyspnea, bone or muscle pain, arrhythmia or frequent urination and thirst. At this time, you must seek medical treatment in time, and don't endure it, otherwise it will cause very serious consequences. Calcium citrate tablets are not only rich in calcium, but also contain vitamin D to promote calcium absorption. Inferring whether a calcium supplement product is good or not depends on whether there is vitamin D in them. Without vitamin d, it will not be absorbed by the body.