Calcium supplements are not the more expensive the better. Calcium carbonate is the most commonly used calcium supplement. There are various forms of calcium supplements. Before the people buy calcium, they will surely wonder what form of calcium is the best? The common calcium compounds are divided into inorganic calcium and organic calcium. Inorganic calcium mainly includes calcium carbonate, calcium citrate, calcium lactate, and calcium gluconate for the organic calcium category. They are made in the form of tablets, capsules, effervescent tablets, oral solution, chewable tablets, etc. When choosing, in addition to your preference, you should also consider which supplement is more suitable for you. For adults with normal or high stomach acid secretion, you can choose calcium carbonate; if you have gastric disorders, such as atrophic gastritis, you can choose organic calcium due to low stomach acid secretion. Young children can choose calcium lactate or calcium gluconate. The most noteworthy thing is that the choice of calcium supplements should not be based on price, because calcium supplements are not the more expensive the better. There are many kinds of calcium supplements on the market, among which calcium carbonate is the cheapest and most commonly used compound with a high calcium content of about 40%. Calcium citrate has a lower calcium content than calcium carbonate, about 20%, so it may be necessary to take more than twice the amount of tablets to achieve the recommended intake.