Botulinum, or “botulinum toxin”, serotype A. As a therapeutic agent, botox is derived from a specific toxin C. Although onabotulinum toxin is the only active ingredient in botox, each of them has a specific function to relax existing lines and prevent future ones. The main ingredient in Botox is a purified form of botulinum toxin type A, also known as onabotulinumtoxinA, which is derived from the bacteria Clostridium botulinum.