Lice Prevention Studies show that lice have developed a resistance to the most commonly used lice products on the market, such as RID, Nix, and Lindane. Furthermore, the flimsy plastic lice combs that come with lice kits sold at major drugstores are not capable of removing very small nits (lice eggs).Even more alarming is the fact that the major prescription shampoos and treatments normally used to treat head lice are extremely toxic! These toxic lice treatments present a major health threat to over 12 million children each year.Licenders products are formulated using natural herbs. Our products are non-toxic, and do not contain any harsh chemical additives. They are also guaranteed to be effective 100% of the time. Licenders Shampoo uses a special enzyme known as protease to kill the lice. Protease enzyme is produced naturally by insects to shed their exoskeleton when they outgrow it. Lice can not develop a resistance to natural lice products using enzymes since they rely on it for their very existence!Our products also use citronella oil, an essential oil obtained from leaves of lemongrass. Citronella oil is a renowned plant-based insect repellent, and has been registered for this use in the United States since 1948.