Mineral intake ranges for adults Calcium 250-1,000 mg Chromium 200-400 mcg Copper 1-2 mg Iodine 50-150 mcg Iron 15-30 mg Magnesium 250-350 mg Manganese 10-15 mg Molybdenum 10-25 mcg Selenium 100-200 mcg Silica 1-25 mg Vanadium 50-100 mcg Zinc 15-20 mg P...