Molecular hydrogen (H2 gas) has powerful antioxidant and anti-inflammatory effects, making it potentially useful for COVID-19, as explained in this video by Tyler W. LeBaron, founder of the science-based nonprofit Molecular Hydrogen Institute.
In his video, LeBaron reviews the pathophysiology of COVID-19 and explains why H2 is being clinically investigated by discussing the proposed mechanisms of how molecular hydrogen might ameliorate this particular disease.