What is it? Magnesium is a light metal that's also the eleventh most abundant element by weight in your body.

How does it help? Many hangover symptoms are thought to be caused by alcohol-induced magnesium depletion. Adding magnesium to your diet helps counteract the depletion.

How much? As a long-term preventative -- 400 mg per day.
As a rescue remedy to alleviate your suffering -- also 400 mg.