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.
[Nitro- + methane.] (Chem.) A nitro derivative of methane obtained as a mobile liquid; -- called also nitrocarbol.A colorless, oily liquid, CH3NO2, used in making dyes and resins, in organic synthesis, as a fuel in race car engines, and as a rocket propellant.