Magnesium is the fourth most abundant element in your body,1 and one of the seven essential minerals we can’t live without.2 It’s necessary for the healthy functioning of most cells, but especially your heart, kidneys, and muscles. Low levels of magnesium impede cellular metabolic function and deteriorate mitochondrial function. As it is also required for the activation of vitamin D, deficiency may hamper your ability to convert vitamin D from sun exposure and/or oral supplementation. Unfortunately, deficiency is common and research shows even subclinical deficiencies may jeopardize your health. If you’ve recently had a blood panel drawn, you may assume it would reveal a magnesium deficiency. However, only 1 percent of magnesium is distributed in your blood, which means a blood test is not useful to determine whether you are deficient at the cellular level.3 Recent research confirms optimal levels of magnesium are necessary for your heart4 and kidney health.