Magnesium is an electrolyte mineral that plays an important role in heart and nerve health. The central nervous system acts as our body's own internal electrical system and carries the electrical impulses that control all muscle function. This includes our most important muscle, the heart. The electrical impulses in our nervous system are generated by positively and negatively charged ions. Magnesium is one of the critical positively charged ions. If magnesium levels drop too low, it begins to affect the functioning of our entire body, including the heart. When it comes to magnesium supplements, there are many different forms of the mineral. Some of these include magnesium glycinate, magnesium citrate, magnesium oxide, and even magnesium l-threonate. So which magnesium is best? Well, each of these magnesium sources is beneficial but magnesium gluconate is the one that is typically used in medical settings because of its easy absorption and ability to enter the bloodstream quickly.