👉 An antioxidant is a substance that helps to protect your body from free radicals, which are unstable molecules that can damage cells and tissues over time. These antioxidants act as "shields" or "bottles of water" for your cells, helping to neutralize free radicals before they cause damage. Some examples of antioxidants include vitamins C, E, and B12, as well as various plant compounds like resveratrol, lutein, and zeaxanthin.