What does magnesium do in the body?

Magnesium is an essential mineral involved in more than 300 reactions — energy production, muscle contraction and relaxation, nerve signaling and protein synthesis. It's lost through sweat and activity, so people who feel short on it from diet may top up. A common guide is 200–400 mg a day, with supplemental amounts kept under the adult upper guide (about 350 mg/day).

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