Calcium Lactate and Calcium Carbonate can’t be compared which is better. Calcium carbonate is a medicine and calcium lactate is a health supplement. Since each person has different needs, the decision on which calcium supplement to choose needs to be made after a comprehensive evaluation by a doctor. 1. Calcium Lactate: Calcium Lactate is also known as Calcium Whey. It is usually a mixture of natural cow’s milk extracted through certain physical methods. Its main components are calcium citrate and tricalcium phosphate, which are inorganic salts. Since it is extracted from cow’s milk, it is easy to be digested and absorbed by the human body when taking calcium supplements in daily life, and will not cause indigestion and other discomforts (except for lactose intolerant patients), and will not irritate the gastrointestinal tract. However, milk calcium is a health product and cannot replace the therapeutic effect of medicines. 2. Calcium carbonate: Calcium carbonate, as a kind of calcium supplement drug, has the function of supplementing calcium. It is mainly used in the prevention and treatment of calcium deficiency. However, gastrointestinal discomfort, such as belching and constipation, may occur after taking it. Since the particles of calcium carbonate are relatively large, it is easy to form stones in the body after taking it for a long time, so it is not recommended for those who have a history of stone disease. To sum up, when taking calcium supplements, it is recommended to go to a professional medical institution and follow the doctor’s advice in choosing calcium supplements.