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1 A neurotoxin is a toxic agent or substance that inhibits, damages or destroys the tissues of the nervous system, especially neurons, the conducting cells of your body's central nervous system. 2  This is an example of a cytotoxin.
Interestingly, Botox is a neurotoxin protein actually considered one of the most poisonous natural substances in todayâs world. It carries questionable risks of possible side-effects and even faces strong accusations of being linked to several deaths by the FDA.