Botox is a purified form of the botulinum toxin that is obtained from bacteria. Though it is deadly in larger amounts, the tiny, regulated amount of Botox given to correct wrinkles has been used safely for decades.
Botox works by blocking nerve signals in the muscles where it is injected. When those nerve signals are interrupted, the affected muscle is temporarily paralyzed or frozen. Without movement of these selected muscles in the face, certain wrinkles may be softened, reduced, or even removed.
Botox and other treatments made with botulinum toxin are sometimes called neuromodulators or neurotoxins. Treatments made with botulinum toxin are sold under the brand names Botox Cosmetic®, Dysport®, and Xeomin®.