Antiperspirants, on the other hand, contain aluminum salts that help stop perspiration. That is, they have an effect on the structure or function of the body, so they fall under the FDAâs over-the-counter drug regulation and must carry an expiration date, though they donât really need one.
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LINKS. Nitrous Oxide. Nitrous oxide (N 2 O) is a colourless, non-flammable gas with a sweetish odour, commonly known as laughing gas, and sometimes used as an anaesthetic. Nitrous oxide is naturally produced by oceans and rainforests.