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In United States, the Recommended Daily Allowance for Vitamin C is 90mg for males and 75mg for females. The RDA and TUL for children, pregnant women, smokers, and breastfeeding women is more. The Tolerable Upper Limit is 2,000 mg. There is an upper limit set on Vitamin C because taking megadoses of it enhances iron absorption. When iron absorption is enhanced you can get iron overload which affects major organs in the body. There are also some studies that say there is a correlation between the amount of kidney stones and the amount of Vitamin C.

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16y ago

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