E and C may reduce the risk of prostate cancer. Other research shows that a high intake of vitamin C may lower the risk of heart disease and cataracts. However, many experts say that there's not enough data to support any of these claims. In addition, taking high doses of some nutrients may be dangerous, particularly for certain populations. For instance, studies are finding that taking beta-carotene supplements may increase a smoker's risk of lung cancer.
Experts agree that the best way to get antioxidants is from eating a varied diet.