How is botulinum toxin used for medical and comestic purposes when a very small dose can kill a person?
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As with pretty much all things, the dose makes the poison. Even water is toxic if you drink too much of it.
Botulinum kills because if paralyzes a person’s muscles, including the diaphragm, which means the person can’t breath. A much smaller amount that’s only injected into a specific location isn’t going to cause systemic effects, but it will paralyze those local muscles, which is the desired effect both for cosmetic purposes and migraine relief.
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