Molecular hydrogen (H2 gas) has powerful antioxidant and anti-inflammatory effects, making it potentially useful for COVID-19. Being the smallest molecule in the universe and having no polar charge, the hydrogen molecule is also able to diffuse through all cell membranes and subcellular compartments, including the nucleus and the mitochondria. It doesn’t need any transporters to do this, so it’s exceptionally bioavailable.

Several Chinese investigators are using H2 therapy in COVID-19 patients, and preliminary results are encouraging.