How is botulinum toxin used for medical and comestic purposes when a very small dose can kill a person?
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Botulism toxic paralyzes muscles, that’s both its medical use and how it kills you. If it gets somewhere it’s not supposed to be, like your thoat, diaphragm, or heart, that will kill you pretty fast. But if it’s somewhere like your face, it can paralyze those muscles and cause them to contract, lifting up your face. It can also be used to treat spasms of certain muscles. The trick is to use very little and only where it’s needed.
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