It is known to everyone the important role that calcium plays in maintaining strong bones and teeth in the human body.  What has also to be considered is the fact that calcium also plays a very important role in maintaining regular heart beats and also help in maintaining nerves and muscles.  Nutri 9 is probably the most concentrated form of Calcium available as a supplement tablet in the market. In addition to calcium Nutri 9 also has Vitamin D as well as Magnesium which is vital for calcium to show its effect on the bones.