Introduction Calcium is one of the important trace elements required by the human body. Its functions include supporting and maintaining the healthy growth and development of human bones, teeth, muscles, etc., as well as maintaining the normal functioning of human nerves, blood, pH, etc. Therefore, calcium supplementation is very important in daily life. At present, the common methods of calcium supplement include milk calcium and calcium carbonate. So, which method is more suitable for calcium supplementation? Next, this article will focus on the absorption effect