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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)

All of these showed efficacy in animal models

controlled human efficacy evidence is lacking and individual results vary

They do not want needles, mixing, syringes, or injection training