In the high-stakes world of professional sports, where concussions and chronic traumatic encephalopathy (CTE) cast long shadows over athletes’ careers and post-retirement lives, a controversial treatment is gaining quiet traction among NFL and UFC veterans. Ibogaine, a potent psychedelic derived from the African iboga shrub, is being sought out by players desperate for relief from brain trauma symptoms, despite its classification as a Schedule 1 controlled substance in the U.S. with no approved ...