
Antioxidants are biologically active substances that act to counter the harmful effects of free radicals. They include certain vitamins ( Vitamin C and E ) , minerals ( Selenium ) and other groups such as carotenoids and bioflavanoids. Many fruit and vegetables contain antioxidants.
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There are natural antioxidants, such as enzymes, vitamins and minerals, within the cat's body. These are designed to protect the body from damage caused by substances called free radicals that are produced during day-to day metabolism. Unless 'mopped up' by the body free radicals can damage cells. As a cat gets older it may get less efficient at mo...
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http://www.cats.org.uk/cat-glossary/

substances such as Vitamins A, C and E and minerals such as copper, magnesium and zinc. Believed to destroy free radicals, which some scientists think may not only accelerate aging but also contribute to the formation of cancers and cataracts.
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Synthetic or natural substances added to products to prevent or delay their deterioriation by action of oxygen in air. In biochemistry and medicine, antioxidants are enzymes or other organic substances, such as vitamin e or beta-carotene, that are capable of counteracting the damaging effects of oxidation in animal tissue. ... (12 Dec 1998) ...
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Vitamins A (including beta carotene), C, and E, thought to repair and protect skin cells by neutralizing damaging free radicals.
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http://www.everydayhealth.com/skin-and-beauty/glossary.aspx

Substances that help the body neutralize free radicals. Beta-carotene, vitamin E, and vitamin C are some examples of the hundreds of naturally occurring antioxidants.
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Antioxidants are substances that slow the breakdown of nutrients and counteract the destructive effect of free radicals (chemically reactive compounds) in the body. There are several types which include vitamins A, E, C complex, and B complex, the minerals selenium and zinc, and the synthetic compounds BHT and BHA. Vitamins A, C, and E as well as B...
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Substances such as vitamin E and selenium that protect cells against damage caused by by-products of normal metabolic processes.
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Vitamins A, C and E, along with various minerals, which are useful to protect the body from 'free radicals'. Free radicals are unstable molecules which react with oxygen. They are naturally created in the body, and are also caused by factors such as smoking and radiation. Free radicals may cause cell damage, which leads to disease.
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substances that protect against cell damage by guarding the cell from oxygen free radicals
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The term for natural and synthetic ingredients that are used to help prevent free radical and environmental damage to our skin. Ingredients include vitamins E and C, grape seed extract, coenzyme Q10, and green tea. Understanding the benefits of antioxidants against the damage caused by free radicals is so important, there is a huge amount of resear...
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https://www.encyclo.co.uk/local/22743

Protective ingredients that prevent free radicals from damaging and aging the skin; these include vitamin C, coenzyme Q10, pomegranate, idebenone and alpha lipoic acid. See also: free radicals.
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A compound that prevents other compounds from oxidizing or become rancid.
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Nutrients and enzymes that neutralize free radicals to help prevent damage and to repair skin cells.
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https://www.ulta.com/glossary/
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