Botulinum toxin is caused by Clostridium Botulinum bacterium, and it's an incredibly powerful neurotoxin. It causes paralysis which can lead to death. You may know Botulinum toxin by it's commercial name - Botox. Yeah, that stuff the doctor injects into your mom's forehead to make her less wrinkly (or into your neck to help with migraines) paralyzes muscles with Botulinum Toxin.