Magnesium carbonate (Latin Magnesium carbonicum) is mainly used to treat heartburn to neutralize the acid in the stomach. In addition, it can be used to supplement magnesium ions, a microelement necessary for the functioning of the body. It is a catalyst for many chemical reactions, so without it, the proper functioning of the body’s carbohydrate, protein and fat metabolism is impossible. It is also an important component that stabilizes cell membranes. It also participates in the transmission of signals through nerve cells and in the proper contraction and relaxation of muscles, including the heart muscle. Magnesium deficiency is manifested by muscle cramps and disturbances in the functioning of the nervous system. However, due to poor absorption from the gastrointestinal tract, supplementation is an additional use of magnesium carbonate.