Oxygen

high concentration O2 is more of a recovery tool (hyperbaric as an example,) for our world. unless you’re doing high altitude training or climbing mountains, it’s not going to drive much performance increase. probably some just since your body is more saturated with O2, but i don’t think it would be worth the squeeze.
 
The guys at the plant that produces gases used to go on about how huffing some pure oxygen could cure a hangover.

Not sure if it was true, they would never sell me a tank of human grade oxygen without a prescription.
 
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