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Antioxidants protect the body
from damage caused by harmful molecules called
free radicals. Many experts believe this damage is a
factor in the development of blood vessel disease (atherosclerosis), cancer, and other conditions.
You are exposed to free radicals:
Antioxidants include some vitamins (such as vitamins C and
E), some minerals (such as selenium), and flavonoids, which are found in
plants. The best sources of antioxidants are fruits and vegetables. You can
find flavonoids in fruits, red wine, and teas. You can also buy antioxidant
supplements. It is best to obtain
antioxidants from a healthy diet.
Antioxidants may play a role in the management or prevention of some medical conditions, such as
Alzheimer's disease, and some arthritis-related
Until more studies are done,
it is best to get your antioxidants from a diet rich in fruits and vegetables
rather than from supplements. Taking supplements in high doses can be harmful.
No single antioxidant alone can protect the body. Most people should eat 7 to 10
servings of fruits and vegetables each day.
The U.S. Food and Drug
Administration (FDA) does not regulate dietary supplements in the same way it
regulates medicines. A dietary supplement can be sold with limited or no
research on how well it works.
Always tell your doctor if you are
using a dietary supplement or if you are thinking about combining a dietary
supplement with your conventional medical treatment. It may not be safe to
forgo your conventional medical treatment and rely only on a dietary
supplement. This is especially important for women who are pregnant or
When using dietary supplements, keep in mind the
Other Works Consulted
Bjelakovic G, et al. (2007). Mortality in randomized
trials of antioxidant supplements for primary and secondary prevention:
Systematic review and meta-analysis. JAMA, 297(8):
Murray MT (2013). Flavonoids: Quercetin, citrus flavonoids, and hydroxyethylrutosides. In JE Pizzorno, MT Murray, eds., Textbook of Natural Medicine, 4th ed., pp. 772–779. St. Louis: Elsevier.
Ronzio RA (2013). Naturally occurring antioxidants. In JE Pizzorno, MT Murray, eds., Textbook of Natural Medicine, 4th ed., pp. 891–914. St. Louis: Elsevier.
Current as of:
January 14, 2014
Adam Husney, MD - Family Medicine
& Kathleen Romito, MD - Family Medicine
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