According to a recent report from ConsumerLab.com, a commercial testing company in White Plains, New York, most magnesium supplements appear to contain levels of magnesium stated on the product label. Only 2 out of 19 products analyzed did not pass the company's testing. One product contained 50% more magnesium than claimed, and one other product contained levels of lead in excess of the State of California regulations.
The supplement found to have excess magnesium would have exposed consumers to 1,200 milligrams of magnesium per day if they followed the label instructions. This is more than three times the upper tolerable intake level for magnesium, which when taken in supplement form, can cause diarrhea.
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