Note that it says "molecules" so that means free radicals don't make the distinction between foreign bodies and healthy cells. And when free radicals start attacking the body's own cells, you can guess what the results are - Aging. If only there was a way to get rid of those harmful free radicals. Human beings are one of the few organisms that cannot produce their own herbal antioxidants for the body's use. That is why we have to depend on our diet in order to get our dose of herbal antioxidants. Herbal antioxidants are of course found in fresh produce, fruits, and vegetables. A large number of members of the berry family are excellent sources of herbal antioxidants. Recently, scientists have discovered the substance responsible for many of the health benefits we've been receiving from plants. Fruits and vegetables it seemed contain chemical substances that act on specific, harmful molecules inside our bodies to stop them from damaging our cells. Because these substances work on oxygen by-products called free radicals, they have since come to be known as natural antioxidants. "Activin is a powerful inhibitor of free radical induced lipid peroxidation and DNA fragmentation," Bagchi further explained. "This is significant because free radicals can destroy cell membranes and damage DNA, and may be a root cause of certain types of cancer, heart disease, and even the aging process itself. Now, you can find antioxidant supplements in the form of Vitamin A capsules in almost any pharmacy or health food store. Beta-carotene antioxidant supplements generally come from orange, yellow, and green leafy vegetables and fruit. It has been observed that people who eat a lot of foods rich in beta-carotene are not generally prone to cancer. Vitamin C antioxidant dietary supplement is perhaps the most famous form of antioxidant available. Also known as ascorbic acid, bottles of this antioxidant dietary supplement can be found in any pharmacy or health food store. Research show that this particular form of antioxidant dietary supplement greatly helps in boosting the immune system and thus aid in preventing the onset of degenerative diseases.