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.

Continue Learning about Vitamin C

Vitamin C Is Not an Exercise Replacement
Vitamin C Is Not an Exercise Replacement
John F. Kennedy once said, “There are risks and costs to a program of action, but they are far less than the long-range risks and costs of comfortable...
Read More
How much vitamin C do I need per day?
Dr. Michael Roizen, MDDr. Michael Roizen, MD
Because vitamin C is water-soluble, it washes out of your body when you urinate. Therefore, it is im...
More Answers
How does vitamin C help reduce stress?
Dr. Mehmet Oz, MDDr. Mehmet Oz, MD
Vitamin C helps to reduce stress because it allows the body to quickly clear out cortisol, a primary...
More Answers
3 Antioxidant-Rich Vegetables
3 Antioxidant-Rich Vegetables

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.