Botulinum toxin is a potent neurotoxin produced by the bacterium Clostridium botulinum. It blocks nerve signals to muscles, leading to temporary paralysis. This toxin is responsible for a serious illness known as botulism, which can occur from consuming contaminated food or through wounds. Despite its dangers, botulinum toxin has medical applications. It is used in small, controlled doses for various treatments, including reducing muscle spasms and smoothing wrinkles in cosmetic procedures. The most well-known brand for cosmetic use is Botox, which utilizes the toxin's ability to relax muscles for aesthetic purposes.