This document updates previously posted information for parents about infant
feeding and novel H1N1 flu (swine flu). It now more clearly addresses
parents who are formula feeding as well as breastfeeding, suggests that parents
sick with novel H1N1 flu (swine flu) find someone who is not sick to feed the
baby, and provides more detailed strategies for breastfeeding mothers to
maintain breastfeeding throughout the course of infection. This document is
based on current knowledge of the novel...
Vitamin C is an important vitamin and antioxidant that the body uses to keep you strong and healthy. Vitamin C is used in the maintenance of bones, muscle, and blood vessels. Vitamin C also assists in the formation of collagen and helps the body absorb iron.
Vitamin C is found naturally in vegetables and fruits, especially oranges and other citrus fruits. This key vitamin is also available as a natural dietary supplement in the form of vitamin C pills and vitamin C chewable tablets.
Can Vitamin C Prevent or Treat Cold Symptoms?
Vitamin C has been studied for many years as a possible treatment for colds, or as a way to help prevent colds. But findings have been inconsistent. Overall, experts have found little to no benefit from vitamin C for preventing or treating the common cold.
In a July 2007 study, researchers wanted to discover whether taking 200 milligrams or more of vitamin C daily could reduce the frequency, duration, or severity of a cold. After reviewing 60 years of clinical research, they found that when taken after a cold starts, vitamin C supplements do not make a cold shorter or less severe. When taken daily, vitamin C very slightly shorted cold duration -- by 8% in adults and by 14% in children.
So what does all this mean?
According to this research, the average adult who suffers with a cold for 12 days a year would still suffer for about 11 days a year if that person took a high dose of vitamin C every day during that year.
For the average child who suffers about 28 days of cold illness a year, taking daily high-dose vitamin C would still likely mean about 24 days of cold illness.
When vitamin C was tested for treatment of colds in 7 separate studies, it was found to be no more effective than placebo at shortening the duration of cold symptoms.
Is Vitamin C Safe to Take?
In general, vitamin C is safe to take when ingested through food sources such as fruits and vegetables. For most people, taking vitamin C supplements in the recommended amounts is also safe. The RDA or recommended daily allowance is 90 mg for men and 75 mg for women. High doses of vitamin C (greater than 2000 milligrams per day for adults) may cause kidney stones, nausea, and diarrhea.
If you're unsure about taking vitamin C for colds, talk to your health care provider.
National Institute of Allergy and Infectious Diseases: "Common Cold."
PubMed: "Intake of Vitamin C and Zinc and Risk of Common Cold: A Cohort Study."
Mayo Clinic: "Cold Remedies: What Works, What Doesn't, What Can't Hurt."
Medscape: "Vitamin C May be Effective Against Common Cold. Primarily in Special Populations."
Douglas, R.M. The Cochrane Collaboration, 2007.
UptoDate: "The common cold in adults: Treatment and Prevention."
Medline Plus: "Flu" and "Common Cold."