Health Library

The Health Library is a collection of health and wellness resources created for learning and accessibility. Select a topic below for related health information or search for a topic in the search bar for more information on other medical conditions.

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Antioxidants

Antioxidants are natural compounds that protect the body from damage caused by molecules called free radicals. Certain levels of free radicals in the body are normal. But things like pollution, smoking, and toxic heavy metals can cause harmful levels of free radicals in the body. Many experts believe that this damage is a factor in the development of cancer and other conditions.

Antioxidants include some vitamins, such as vitamins C and E, and some minerals, such as selenium. They also include other compounds like flavonoids and polyphenols, which are found in plants.

Fruits and vegetables are good sources of antioxidants. You can also buy antioxidant supplements. But it's best to get antioxidants from healthy foods.

Why It Is Used

Antioxidants may play a role in the management or prevention of some medical conditions, such as some cancers, macular degeneration, Alzheimer's disease, and some arthritis-related conditions.

Risks

The best way to get enough antioxidants is to eat foods that are good sources of them, especially fruits and vegetables. Taking supplements in high doses can be harmful. No single antioxidant alone can protect the body.

The U.S. Food and Drug Administration (FDA) doesn't regulate dietary supplements in the same way it regulates medicines. A dietary supplement can be sold with little or no research on how well it works.

Always tell your doctor if you're using a dietary supplement or if you're thinking about combining a dietary supplement with your standard medical treatment. This is especially important if you are pregnant or breastfeeding.

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Current as of: October 7, 2025

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Ignite Healthwise, LLC education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

This information does not replace the advice of a doctor. Ignite Healthwise, LLC, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.