According to the 2001–2002 National Health and Nutrition Examination Survey (NHANES), mean intakes of vitamin C for nonsmoking adults are:
105.2 mg/day for males
83.6 mg/day for females; 120 mg/day while breastfeeding
The maximum recommended daily intake of vitamin C for adult males and females is 2,000 mg.
Vitamin C inadequacy can occur with intakes that fall below the RDA but are above the amount required to prevent overt deficiency (approximately 10 mg/day). The following groups are more likely than others to be at risk of obtaining insufficient amounts of vitamin C.
People with low vitamin C, because of smoking or older age, for example, may find supplements beneficial.
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