**2. Vitamin C dosage in health**

The dosage of vitamin C needed for maintenance of normal health is called the recommended daily allowance (RDA). Australia's National Health and Medical Research Council [6] defines it as the "average daily dietary intake level that is sufficient to meet the nutrient requirements of nearly all (97–98%) healthy individuals in a particular life stage and gender group." This value is highly variable, depending on the region, country, or organization concerned [7]. For example, the RDA is 90 mg/ day for men and 75 mg/day for women in the US and Canada; 40–45 mg/day in the UK, India, and Australia; and 110 mg/day in France, Germany, and other European countries [7]. As reviewed by Carr and Lykkesfeldt [7], there are various reasons for these discrepancies ranging from optimization of health (up to 200 mg/day), boosting the immune system, and replacing the daily turnover to prevention of scurvy (45 mg/day).
