Free radicals are highly reactive molecules that are produced during normal cellular processes and can cause oxidative damage. Antioxidants help prevent this damage by neutralizing free radicals. Common sources of free radicals include mitochondria, inflammation, pollution, and radiation. Free radicals can damage cells by oxidizing lipids, proteins, and DNA, and are implicated in many diseases including cancer, atherosclerosis, and neurological conditions. Antioxidants help reduce oxidative stress and may protect against disease.

1. Free radicals and antioxidants in health and disease

5. Univalent reduction steps of oxygen

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