The article reports that the manufacturer of Centrum Silver, a multivitamin designed for people over the age of 50, has altered the levels of 15 nutrients and switched from vitamin D2 to D3, which is better for bones. Of the nutrients that have changed, nine, including vitamins C, D, and K have increased doses. With these modifications, Centrum Silver remains iron-free, which is beneficial to those who are at risk for hemochromatosis.