Article from Nylon.com:
If you ever took chemistry, you know that water is two parts hydrogen and one part oxygen (hence H2O). In recent years, wellness gurus have been taking the most basic and essential of beverages and adding supplementary benefits, with the likes of aloe, rose, and alkaline water on the rise. Now, a new trend in the States—although one that’s been in Japan for several decades—is looking to amp up the health factor of water, the compound that makes up the majority of your body—not to mention the planet. Almost ironically, it’s with the most simple of molecules: hydrogen.
You’re probably thinking, If water has hydrogen in it already, how can you add more hydrogen without making it something else? I was too, so I reached out to Dr. Nicholas Perricone, a dermatologist, nutritionist, and owner of his own namesake cosmetics and skin-care line, as well as the latest distributor of hydrogen water. Dr. Perricone explained that molecular hydrogen (or H2, as hydrogen cannot exist alone as a molecule and must bond with another) plus water does not equal plain water. “Think about it as if you were stirring sugar or salt into a glass of water—it dissolves, but it changes the makeup of the water, right?” Right.