Botulinum toxin is obtained from bacteria, and it is purified before being injected into the skin for cosmetic purposes. Though it is deadly in larger amounts, the tiny, regulated amount of Botulinum toxin given to correct wrinkles has been used safely for decades.

This substance 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 the movement of these selected muscles in the face, certain wrinkles may be softened, reduced, or even removed.

Treatments made with botulinum toxin are sold under the brand names Botox Cosmetic, Dysport, Xeomin, and JEUVEAU.