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How much vitamin C do I need if I have a cold?

Dr. Michael Roizen, MD
Internal Medicine
When you begin to show signs of a cold, increase your vitamin C to as much as 4 grams (4,000 milligrams) a day, taken with plenty of water (eight glasses for 4 grams). Although this won't cure colds, it will lessen the severity of the symptoms. For example, when you have a cold and take your C, you may find that you can keep exercising.

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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.