If your goal is to avoid all suspicion of harmful chemicals, than using traditional deodorant or antiperspirant will make that very difficult. The easiest way to keep your body safe and healthy is to avoid entirely all chemical laden deodorants and antiperspirants, and begin using natural deodorants.
Medical Definition of nitro. : containing or being the monovalent group NO2 united through nitrogen.
Nitrous and Auto Racing. In racing, nitrous is injected into an automobile's air intake to increase power. This isn't magic -- basically it is just providing more oxygen which allows more fuel to burn per stroke. The extra fuel per stroke gives you the extra power -- the nitrous just provides the oxygen needed to burn that fuel.