hyperbaric oxygen
Most of the stuff you hear about hyperbaric oxygen being used to treat is total nonsense. It isn't effective at treating autism or cerebral palsy.
But an article in the Times makes the point that it is effective for treating some things:
The Undersea and Hyperbaric Medical Society, the professional organization in this field, recognizes 13 conditions for which it is legitimate to place patients in high-pressure chambers that force pure oxygen into their blood and tissues. Eleven of those conditions have been approved by Medicare for reimbursement, indicating that solid evidence supports…