Most People Are Deficient In Magnesium, But It Wouldn’t Be Detected In [normal serum] Blood Tests

"...Magnesium is both a mineral and an electrolyte.
As a mineral, magnesium plays an important role in keeping the heart and bones strong. Actually, all of our organs need magnesium. The mineral adds to the production of energy and supports the regulation of other nutrients and cholesterol production in the body such as calcium, zinc, and vitamin D.

Magnesium plays a role in hundreds of metabolic reactions in the body such as the breaking down of carbohydrates and fats. In fact, it out-performs all other minerals as a regulator. It’s the fourth most abundant mineral in the body. Importantly, the body needs magnesium for energy and cellular production, proteins, enzymes, and antioxidants....

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This is an article about magnesium deficiency.