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What Is in Coffee?
There's no surprise that coffee contains caffeine—that's the main reason people drink it in the morning and rely on it for a midday pick-me-up. You might have also heard that caffeine, although a lifesaver when you're tired, is a diuretic that can cause dehydration. But is it really? Many recent studies have found that caffeine is a very mild diuretic at most; a review of 10 studies at the University of Connecticut found that 12 out of 15 cases showed that people went to the bathroom the same amount, regardless of whether or not the water they drank had caffeine in it.

This study even claimed that there was no difference between males who consumed coffee versus water. It’s all still up for debate, but there’s an easy solution for those worried their coffee habit is dehydrating their skin—just drink more water.

Coffee also contains antioxidants. We all know that eating a diet rich in antioxidants can help improve your skin health, but research into the actual process of how antioxidants are absorbed and utilized in the body is still ongoing. However, we do know this: free radicals cause signs of aging, like fine lines, wrinkles, and brown spots. Antioxidants (whether consumed orally or applied topically) fight free radicals, and thus, help to fight signs of aging.1