Injectable treatments contain a protein produced by the the bacterium Clostridium botulinum. It relaxes muscle by temporary blocking nerve impulses to the injected muscles. This reduces muscle activity that causes lines and wrinkles.
The cosmetic effect of this treatment was first documented as early as 1989 and was approved by the FDA in 2002. It is now regularly used by many individuals, both male and female, as it is less intrusive and less artificial in appearance than traditional forms of treatment such as plastic surgery.