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There are many scientists who believe that the wear and tear of time causes cell damage that results in our aging. Some of those scientists associate a diet rich in antioxidants as helpful in slowing the aging process. (ref) Dogs and cats are carnivores. Even if you fed them the green leafy vegetables and berries that are rich in antioxidants, they probably don't have the proper enzymes to absorb those nutrients to the extent that we do. Carnivores normally obtain their antioxidants from raw meat, fish and eggs. The heating processes pet food manufacturers use to produce their foods destroy much of those natural antioxidants. (ref) [In the process of fulfilling USDA demands that their products be free of salmonella, manufacturers get carried away in the baking process. in other cases, fats sprayed on kibble for flavor enhancement go rancid ] That is one of the many benefits of feeding you pet some wholesome, very lightly cooked or raw ingredients. (ref) Things like egg and cold water fish.

There are a very large number of antioxidants present in food. More are being discovered all the time and some are thought to help brain function. (ref, ref2 ,ref3) Health food stores are full of antioxidant products too. If you don't attempt to add fresh food antioxidants to your pet's diet, I see little downside to giving them those products in moderation and in proportion to their smaller size. But I can not tell you that they will be effective.