Magnesium is a very important mineral which is present in the human body. It is vital to the proper functioning of the body. Magnesium is connected to muscle function. A deficiency of magnesium may cause many health problems, including muscle tremors, constipation, diarrhea and in extreme cases - death. Magnesium is also an important mineral for heart health. It helps to regulate the calcium blood level and it also helps relax muscles.