I'd been wondering the same thing, but it was because of a friend of ours that ordered some other herbal deworming capsules, and is complaining of "itching inside". But, then again, he's been all over the world scuba diving...so an allergic reaction? or parasites being killed? He's in his 60's, has never done a parasite cleanse of any kind, has been all over the world scuba diving, and has an indoor dog, 4 large outside dogs, and a number of gentle cats.