Antioxidants play a critical role in cellular health by neutralizing harmful molecules called free radicals, which can cause oxidative stress and damage to DNA, proteins, and lipids. Oxidative stress contributes to various diseases, including cancer, cardiovascular disorders, and neurodegeneration. By stabilizing free radicals, antioxidants help mitigate this damage and support the overall integrity of cells. Sources of antioxidants include vitamins such as vitamin C and vitamin E, minerals, and various plant compounds found in fruits and vegetables, which enhance the body's defense against oxidative stress.