Magnesium... is the 11th most abundant element in the human body
Magnesium is the 11th most abundant element in the human body by mass. Magnesium ions are found in every cell in the body. Magnesium is necessary for hundreds of biochemical reactions in the body. The average person requires 250 to 350 mg of magnesium each day or about 100 grams of magnesium annually.
If you'd like to read more about this Friday fact, check out this website: http://www.sciencekids.co.nz/sciencefacts/metals/magnesium.html