TNT is a blend of minerals and herbs naturally found in our environment. Our patent pending process is what makes TNT potent enough to get the job done. The main ingredient is calcium, which in the form used by us, is actually beneficial to frogs and birds if ingested. All ingredients used in TNT are FDA approved so although our product is a topical, you can have peace of mind knowing it will not harm your animals if they should ingest it, such as a cat grooming itself.