Botulinum toxin

Botulinum toxin is a poison that can cause harm to people if they get too much of it. When it's used in tiny, regulated doses, it can actually help people. It can be injected into muscles in order to make them relax and stop contracting, which can help reduce pain and make it easier to move around. Doctors use it to treat people with certain conditions such as muscle spasms, neck pain, and chronic headaches. Botulinum toxin can also help lessen the appearance of wrinkles, because wrinkles are caused by repeated muscle contractions over time.