Here is a research article found in Pubmed.gov or NCBI about Retinal Ischemia–Reperfusion Injury. The study suggested that hydrogen-loaded infuse eye drops is great for neuroprotective and antioxidative therapeutic treatment for acute retinal I/R injury. While currently none of Qlife products does not qualify for these therapies. Nevertheless, these studies show how H2 can help in medical studies on animals and does not contain any known toxic. The link to the study https://www.ncbi.nlm.nih.gov/pubmed/19834032
or directly to the full report https://iovs.arvojournals.org/article.aspx?articleid=2186289
Here is a quick abstract
Purpose.: Retinal ischemia-reperfusion (I/R) injury by transient elevation of intraocular pressure (IOP) is known to induce neuronal damage through the generation of reactive oxygen species. Study results have indicated that molecular hydrogen (H2) is an efficient antioxidant gas that selectively reduces the hydroxyl radical (· OH) and suppresses oxidative stress-induced injury in several organs. This study was conducted to explore the neuroprotective effect of H2-loaded eye drops on retinal I/R injury.
Methods.: Retinal ischemia was induced in rats by raising IOP for 60 minutes. H2-loaded eye drops were prepared by dissolving H2 gas into a saline to saturated level and administered to the ocular surface continuously during the ischemia and/or reperfusion periods. One day after I/R injury, apoptotic cells in the retina were quantified, and oxidative stress was evaluated by markers such as 4-hydroxynonenal and 8-hydroxy-2-deoxyguanosine. Seven days after I/R injury, retinal damage was quantified by measuring the thickness of the retina.
Results.: When H2-loaded eye drops were continuously administered, H2concentration in the vitreous body immediately increased and I/R-induced · OH level decreased. The drops reduced the number of retinal apoptotic and oxidative stress marker–positive cells and prevented retinal thinning with an accompanying activation of Müller glia, astrocytes, and microglia. The drops improved the recovery of retinal thickness by >70%.
Conclusions.: H2 has no known toxic effects on the human body. Thus, the results suggest that H2-loaded eye drops are a highly useful neuroprotective and antioxidative therapeutic treatment for acute retinal I/R injury.”