“…Thus, inhalation of H 2 gas markedly suppressed focal ischemia and reperfusion (I/R)-induced brain injury in rats by buffering the effects of oxidative stress. From then on, researchers have extensively investigated the functions and mechanisms of H 2 , studies indicated that supplement of exogenous H 2 has the potential abilities to protect against acute or chronic damage of tissues or organs, including brain, heart, blood vessel, lung, stomach, intestine, pancreas, liver, gallbladder, kidney, testis, ovary, breast, eye, ear, bones, skin, et al (Guo et al, 2013;Sun et al, 2013;Zhang et al, 2016a;Zhang et al, 2016b;Ge et al, 2017;Zhang et al, 2017;Frajese et al, 2018;Zhang et al, 2018b;Chen et al, 2019;Tan et al, 2019;Tao et al, 2019). H 2 dissolved in medium protected PC12 cells against cell death in a dose-dependent manner, as that H 2 > 25 mM had significant anti-oxidative effect (Ohsawa et al, 2007).…”