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-. a combining form or an adjective denoting the presence of niter. Nitro-. a combining form (used also adjectively) designating certain compounds of nitrogen or of its acids, as nitrohydrochloric, nitrocalcite; also, designating the group or radical NO2, or its compounds, as nitrobenzene.