Melatonin

The FAA has no specific regulation banning melatonin, but they prohibit flying while taking any medication that causes sedation or impairment. Melatonin is generally considered okay if you can prove you have no residual side effects (like grogginess) and you are fully functional after waking up. The safety net rule is: Don't fly until you've waited at least five half-lives after the last dose, and never fly if you feel residual effects
 
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