Table 6—

Adult DRIs for select vitamins and minerals

RDATolerable upper intake levelAdverse effects upon which upper intake level is based
Vitamin A700 μg/day for women 900 μg/day for men3,000 μg/day
Vitamin B61.3 mg/day100 mg/daySensory neuropathy
Vitamin B122.4 μg/dayInsufficient data to set upper intake level
Folic acid400 μg/day of dietary folate equivalents1,000 μg/day from fortified food and supplement intake (exclusive of food intake)
Niacin14 mg/day niacin equivalents for women, 16 mg/day niacin equivalents for men35 mg/day niacin equivalentsFlushing
Riboflavin1.1 mg/day for women, 1.3 mg/day  for menInsufficient data to set upper intake level
Thiamin1.1 mg/day for women, 1.3 mg/day  for menInsufficient data to set upper intake level
Vitamin C75 mg/day for women, 90 mg/day  for men2,000 mg/dayDiarrhea and other  gastrointestinal disturbances
Vitamin E15 mg/day α-tocopherol1,000 mg/dayHemorrhage
Calcium1,000 mg/day for adults <age 50 years, 1,200 mg/day for adults >age 50 years2,500 mg/day
ChromiumInsufficient data to set RDA; adequate intake is 25 μg/day for women and 35 μg/day for menNot established
Iron8 mg/day for men and postmenopausal women, 18 mg/day for premenopausal women45 mg/dayGastrointestinal disturbances
Magnesium320 mg/day for women, 420 mg/day for men350 mg/day from supplements  (exclusive of intake from food and  water)
Selenium55 μg/day400 μg/daySelenosis
VanadiumInsufficient data to set RDA or adequate intake1.8 mg/day
Zinc8 mg/day for women, 11 mg/day for men40 mg/dayInterference with the absorption of copper
  • From the Institute of Medicine Food and Nutrition Board.