Standard reference range for serum magnesium: 1.7 to 2.2 milligrams per deciliter (mg/dL) Serum magnesium 27 percent: Functional deficiency What to consider if your results are out of range: If you're low in magnesium, prioritize intake of magnesium-rich foods such as dark greens (spinach, swiss chard), nuts (cashews, almonds), seeds (pumpkin, chia), legumes (black beans, edamame, lima beans), certain whole grains (quinoa), and dark chocolate (75 to 80 percent cocoa)
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Given the smaller amount that makes it into your bloodstream, you need a daily dose to maintain effective levels of the medication
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