The market is flooded with many different lice products claiming to remove head lice. However, recent research indicates that the lice are becoming immune to these products. In addition the harmful chemicals may have an adverse effect on children. As an alternative, try a shampoo containing enzymes. The enzymes in the Licenders Lice shampoo break down the exoskeleton, or shell of the insect and cause it to die on contact. Enzymes are safer and more effective than pesticides.