The Fountain of Youth may seem like it's at your grocery store.

Every year more and more products hit the shelves that promote antioxidants among the ingredients, from soda to lotion to pet food. Americans bought $65 billion of those products in 2011.

But the science behind antioxidants is getting fuzzy. While it's believed they help counter the effects of aging and disease on the cellular level, a growing amount of research shows that taking too many antioxidants might backfire.

That's the story behind a new article by Melinda Wenner Moyer in Scientific American magazine, "The Myth of Antioxidants."