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Participants that were low in vitamin D at the start of the clinical trial were able to successfully raise the levels of the major form of circulating vitamin D (25-hydroxyvitamin D3) if they took a magnesium supplement along with their vitamin D supplement. Surprisingly, participants that had high 25-hydroxyvitamin D3 levels at the start of the trial actually lowered their levels to a more normal range after supplementing with magnesium and vitamin D.

Both in vitro and animal studies have indicated that magnesium deficiency affects enzymes which synthesize and metabolize vitamin D metabolites.

Based off of recent NHANES data ~45% of the US population does not meet the daily requirement for magnesium which is 310 mg/day for adult females and 400 mg/day for adult males.

Magnesium is found at the center of a chlorophyll molecule which is what is responsible for giving plants their green color. That should make it obvious that leafy greens are a great source of magnesium. One cup of cooked spinach contains 156 mg.

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