The Vamousse Head Lice Treatment Mousse is the easy way to eliminate head lice. It has been proven to kill 100% of lice and eggs within 15 minutes, in scientific tests. Vamousse Treatment Mousse is a mousse that works to provide relief for a head lice infestation in the hair and scalp. The active ingredient in this mousse is isopropyl myristate. This works by removing the wax from the lice’s exoskeleton, causing them to dehydrate. Unlike other head lice treatments, the lice won’t build an immunity to this treatment since it’s not poisonous.