Retirement happens to us all. After our working lives are over we are then free to live out the rest of our life in peace. But what counts as peace is different for everybody.
Just about 4% of the mass of the body contains minerals. Some of them are categorized as major mineral values, with the body needing more than 100 mg/day, while some are referred as trace minerals with the body needing less than 100 mg/day.