Magnesium is the fourth most abundant mineral found in every cell in your body. Around 24g of magnesium is found in an average human body, of which a little more than a half is found in the bones, and the rest is found in muscles, organs, and soft tissue. You can find a small amount of magnesium in serum and red blood cells as well. It is a cation involved in hundreds of biochemical reactions in your body. It is vital to strong bones and a healthy heart, proper muscle contraction, and nerve function. It helps control blood pressure and blood sugar as well. 

A lot of foods like raw nuts, spinach, milk, bananas, whole grains, or salmon naturally contain high amounts of magnesium. On the other hand, processed foods are very poor in magnesium. There's good news for chocolate lovers, though; dark chocolate is up at the top of the list of foods that are rich in magnesium. 

The magnesium concentration in your body is mainly regulated by your kidneys, which excrete magnesium when there is too much in your body or reabsorb it when your body lacks it. 

Hypomagnesemia or low magnesium concentration in your body is often connected to reduced intake, chronic alcoholism, kidney problems, or certain medicines. People who have been diagnosed with celiac disease or have other long-lasting digestive problems are also prone to low magnesium levels. 

Hypermagneaseamia or high magnesium concentration in your body is not as common as hypomagnesemia but is usually connected to endocrine disorders, renal dysfunction, or increased intake.