Calcium and magnesium are mineral nutrients that are essential for many  life functions in the human organism. They have a substantial portion in  the forming of the inorganic substance of bones and teeth. Particularly  with sports, the body loses considerable amounts of minerals such as  calcium and magnesium which should be replaced. 
Each tablet contains: 300mg calciumcarbonat and 200 mg magnesium carbonate (equivalent to 120mg calcium and 50mg magnesium).