Clinical TrialInhalation of hydrogen gas elevates urinary 8-hydroxy-2′-deoxyguanine in Parkinson’s diseaseMHID-0476956PMID: 307136662018Medical Gas ResearchMasaaki Hirayama, Mikako Ito, Tomomi Minato, Asako Yoritaka, Tyler W. LeBaron, Kinji OhnoHyposmia is one of the earliest and the most common symptoms in Parkinson’s disease (PD). The benefits of hydrogen water on motor deficits have been reported in animal PD models and PD patients, but the effects of hydrogen gas on PD patients have not been studied. We evaluated the effect of inhalation of hydrogen gas on olfactory function, non-motor symptoms, activities of daily living, and urinar