 Aging is associated with a variety of physiological changes, including decreased cognition, physical weakness, and increased risk of disease. Oxidative stress is a major contributor to these changes, and antioxidants have been shown to be effective at reducing it. Antioxidants are molecules that neutralize free radicals, which are unstable oxygen atoms that cause damage to cells when they react with other molecules. By neutralizing free radicals, antioxidants help protect against oxidative stress and its effects on aging. Research suggests that antioxidants may also play a role in improving immunity and increasing lifespan. This article was authored by B. Ling Tan, Mohammed E. S. A. Norhazan, Mohammed E. S. A. Norhazan, and others.