Tablets like Dr Mercola's dissolve directly in a glass of water, while generator bottles use electrolysis to infuse hydrogen into water inside the bottle itself. Both approaches are generally used to create hydrogen-infused water for drinking, and the choice often comes down to convenience, portability, and budget. Neither is intended to diagnose, treat, cure, or prevent any disease.

Molecular hydrogen is a genuinely emerging supplement category, and research is still ongoing compared to more established categories like magnesium or creatine. It's generally described by manufacturers as supporting antioxidant activity, but these are general wellness claims rather than proven medical outcomes. If you have specific health goals or conditions, it's worth speaking with your doctor before adding any new supplement.