Normal brain functions are based on maintaining the partial pressure of brain tissue oxygen within a relatively narrow range
This question is not merely academic
The table presents data on altitude reached, duration of exposure to hypobaric hypoxia, sample size, antioxidant intervention, and participants' age and sex

Ipilimumab Evidence (ipilimumab): The open-label, three-arm, North American Intergroup trial E1609 (NCT01274338) compared two doses of ipilimumab with HDI as adjuvant therapy in high-risk patients with melanoma.[23] A total of 1,670 patients with resected disease (defined by the American Joint Committee on Cancer, 7th edition, as stage IIIB, IIIC, M1a, or M1b) were randomly assigned (1:1:1) to ipi3 or ipi10 every 3 weeks for four doses (induction), followed by the same dose every 12 weeks for four doses (maintenance), or HDI 20 million units/m2 per day, 5 days per week for 4 weeks (induction), followed by 10 million units/m2 daily subcutaneously every other day, 3 days per week for 48 weeks (maintenance).[23][Level of evidence A1] The trial was designed with two coprimary end points, RFS and OS, with a hierarchic analysis to evaluate ipi3 versus HDI followed by ipi10 versus HDI

Many bacteria, such as Borrelia burgdorferi (the Lyme Disease organism),yeasts and some viruses, are susceptible to high levels of oxygen in their immediate cellular environment
Injectable contraceptives : Depot medroxyprogesterone acetate (Depo-Provera) administered every three months offers effective pregnancy prevention independent of digestive function