Indeed, both hypoxia and hyperoxygenation have been associated with neuropsychiatric pathology, and several studies have shown that hyperbaric oxygen or treatment with erythropoietin (EPO) can be efficacious in several psychiatric disorders, including PTSD and traumatic brain disorder (TBI) [11,12,13,14,15,16] (NCT00525863). Here, EPO is linked to post-traumatic stress disorder.