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How effective is vitamin C for colds?

ANSWER

Most studies show that high doses of vitamin C (2-3 grams per day) decrease the duration of cold symptoms by about a day.

SOURCES:

CDC: "Q&A: Preventing the Flu," "Q&A: Cold Vs. Flu."

William Schaffner, MD, chairman, preventive medicine, Vanderbilt University, Nashville, Tenn.

Tracy Wimbush, MD, emergency room specialist, Massachusetts General Hospital, Boston.

Douglas, R. , June 2005. Public Library of Science Medicine

News release, Public Library of Science.

University of Pennsylvania Office of Health Education: "Cold and Flu Remedies: Questions and Answers."

Medline Plus: "Common Cold," "Flu."

Reviewed by Carol DerSarkissian on February 8, 2020

SOURCES:

CDC: "Q&A: Preventing the Flu," "Q&A: Cold Vs. Flu."

William Schaffner, MD, chairman, preventive medicine, Vanderbilt University, Nashville, Tenn.

Tracy Wimbush, MD, emergency room specialist, Massachusetts General Hospital, Boston.

Douglas, R. , June 2005. Public Library of Science Medicine

News release, Public Library of Science.

University of Pennsylvania Office of Health Education: "Cold and Flu Remedies: Questions and Answers."

Medline Plus: "Common Cold," "Flu."

Reviewed by Carol DerSarkissian on February 8, 2020

NEXT QUESTION:

What can you do to prevent colds naturally?

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