Pyrethrins are natural insecticidies produced by certain species of the chrysanthemum plant. Pytherins are fast acting and extremely effective against cold blooded insects such as fleas and ticks. Piperenol butoxide is a synergist to the pyrethrin for additional effectiviness of this shampoo. This shampoo will not leave a residual insecticide on the skin or coat after the animal is bathed. Product safe for use on kittens 8 weeks or older.