Nice opinion piece about taking Magnesium 2015
Whole article at link above.
Dr George Lundberg
"Foods with high magnesium content include dark leafy greens, especially kale, chard, and spinach; tree nuts and peanuts; seeds; oily fish; beans, lentils, legumes, and whole grains; avocado, yogurt, bananas, and dried fruit; dark chocolate; and molasses. Supplemental magnesium is available over the counter in many forms: citrate, amino acid chelate, chloride, glycinate, malate, taurate, carbonate, and others, which vary in absorption, concentration, and bioavailability.
Because you cannot just draw a blood sample and ask the lab to identify a deficiency,
I advise that if a patient has any of the symptoms I listed, you might best just try that old standby, "trial of therapy," and track what happens."