Botulinum toxin is usually used for face-lifting beauty. There is no such name as 4V, and V refers to a V-shaped face, which is more aesthetic.

It is a kind of bacterial endotoxin secreted by the deadly botulinum toxin, which has high toxicity. Botulinum toxin acts on cholinergic motor nerve endings, antagonizing the action of calcium ions in some way, interfering with the release of acetylcholine from motor nerve endings, making muscle fibers unable to contract, leading to muscle relaxation, thus achieving the purpose of wrinkle removal and beauty, and the greater the toxicity, the better the wrinkle removal and beauty effect.

Many stars use this substance for beauty.