Molecular hydrogen (H2) is a gas that is found in trace amounts in the air (0.00005%). It is a powerful antioxidant and can protect cells from oxidative stress-related damage. This has been proved through numerous scientific trials.

Hydrogen-infused water has been granted Generally Recognized as Safe (GRAS) status by the FDA, which means that it is generally considered safe for consumption. In randomized clinical trials, molecular hydrogen intake was generally not associated with side effects, and animals consuming hydrogen-rich water throughout adulthood also did not show side effects.