One of the deadliest poisons known to man is now used to treat wrinkles, migraines, and even, maybe, depression. How did that happen?

Guests: Jean Carruthers, ophthalmologist and “godmother” of cosmetic Botox. David Simpson, neurologist at Mount Sinai hospital in New York. Axel Wollmer, psychiatrist at the Asklepios clinic in Hamburg, Germany.

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