Catnip is a member of the mint family of herbs. The chemical in catnip, nepetalactone, is what cats react to. About 80 percent of adult cats react to this intoxicating herb. The makers of Yeowww Catnip work closely with private farmers to grow, manage and harvest the best organically grown catnip in the world. No chemicals or pesticides are used in the cultivation which means it is perfectly safe for humans and cats.