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How much vitamin C is safe to take?

Jill A. Grimes, MD
Family Medicine
The recommended dietary allowance (RDA) for vitamin C is 75 milligrams (mg) for women and 90 mg for men. Supplements come in 100, 200, and 500 mg tablets, plus the megadose vitamin C powder packets. These typically have 1,000 mg of vitamin C (along with a handful of other vitamins). While vitamin C is water-soluble, which means that extra vitamin C not used by your body will simply exit in your urine, it is possible for megadoses (often exceeding 2,000 mg per day) to cause kidney damage by precipitating a special type of stone formation in the kidneys.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.