I recently saw a local shop selling packages of water infused with hydrogen gas. It was alleged that hydrogen is an antioxidant and therefore drinking hydrogen-infused water would have various health benefits.
One manufacturer of hydrogen water claims that their product "Has beneficial effects on all organ systems including the skin; Acts as a natural antioxidant; Increases energy; Improves athletic performance." They include references to some studies.
(There are other claims like "When infused in water [hydrogen] provides multiple benefits, including increased energy and antioxidant activity", so I interpret their claim to be that the supposed benefits are due specifically to the hydrogen, over and above the benefits of drinking plain water. Thanks to Nat for helping clarify this.)
Is there good-quality evidence that this and similar products provide the claimed benefits to a significant degree?