Using Vitamin C products beyond recommended the limits may cause stomachaches and diarrhea. Even though the body would only use as much as it needs of the vitamin, Vitamin C Overdose can hinder metabolic activities in the body.

The recommended dietary allowance (RDA) for Vitamin C in nonsmoking adults is 75 mg per day for women and 90 mg per day for men. For smokers, the RDAs are 110 mg per day for women and 125 mg per day for men. A dose of 200 milligrams daily is almost enough to maximize plasma and lymphocyte levels.

Higher levels of Vitamin C are needed when under environmental stress such as trauma, fever or infection. Full saturation is reached with daily intakes of 200-500 mg per day (in 2-3 divided doses). This is a water-soluble protein, and anything in excess is excreted by the body. Vitamin C Overdose can cause diarrhea, gas, or stomach upset. Other side effects could be stomach cramps, nausea, and diarrhea, and an increased risk of developing kidney stones. Large amounts of Vitamin C reduce body levels of copper, an essential nutrient. People with iron overload diseases must avoid Vitamin C Overdose, as it increases iron absorption. Special medical advice must be taken by individuals who have kidney stones. If a pregnant mother takes 6,000 mg of Vitamin C, the baby may develop rebound scurvy due to a sudden drop in daily intake. Hemochromatosis patients should not take Vitamin C due to enhanced accumulation of non-heme iron in the presence of this vitamin.