I googled campy, crypt and Saccharomyces Boulardii and it appears it does seem to be effective against both. My vet has been pushing the useless product by purina. I'm not sure it does anything. I'll definitely give the s. boulardii a try. I think I'll also continue with the Miracle-Mineral-Supplement and I've heard good things about Humaworm, so that's on the list too.