One of the top nutrient deficiencies I find as a functional medicine practitioner and also one the most overlooked in conventional medicine is that of magnesium. Magnesium is the fourth most abundant mineral in your body yet one of the most common nutrient deficiencies in America. In fact, between 50 and 90 percent of people lack enough of this vital nutrient. Of your body’s total magnesium, 60 percent is located in your bones with the rest in your muscles and nonmuscular soft tissue. Since your body needs magnesium for close to 300 extremely important biochemical reactions, magnesium is not something that should be overlooked when working to achieve optimal health.