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The recommended daily intake of vitamin C varies according to age, sex, risk group cigarette smokers, alcohol users, institutionalized elderly and subjects on certain drugs) and criteria applied in individual countries. The RDAs in the USA for vitamin C were recently revised upwards, to 90 mg/day for men and 75 mg/day for women based on pharmacokinetic data. For smokers, these RDAs are increased by an additional 35 mg/day. Also for pregnant (85 mg/day) and lactating women (120 mg/day) higher amounts of vitamin C are recommended. The RDAs are in a similar range in other countries. Recent evidence sets the estimate for the needs to maintain optimal health in the region of 100 mg daily.
