system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is Botulinum toxin, the most lethal toxin known, purposefully injected into humans for cosmetic surgeries such as botox? Is there nothing else that could be used?
gpt
Simply put, it is the most effective at what it does. 

This is sort of like how we use (potentially) deadly poison's for anesthesia. There are other potential options (botox for cosmetic surgery is basically a paralyzing agent), but none last as long and work as efficiently, so we don't use them. With anesthesia there are potentially less deadly chemicals we could use, but on the flipside, less potent ingredients means we need to administer more, more often, which can cause other problems.