Magnesium carbonate, chemical formula MgCO3, is a white powdered inorganic compound containing magnesium. Magnesium carbonate is chemically stable, non-toxic, tasteless and non-combustible. With acidic acid stronger than carbonic acid to produce salt and carbon dioxide and other substances, insoluble in water, acetone and liquid ammonia. It absorbs water and oil, so gymnasts, weightlifters and rock climbers often use magnesium carbonate to wipe their hands to keep them dry, but magnesium carbonate can cause skin allergies in some people. In addition, magnesium carbonate can also be used as an acid-making agent, constipation drugs and other gastrointestinal related drugs.