They say that the active ingredients does not absorbed by the chickens gut! So there is not any problem, did you used them?
Do you know what are the specific ingredients? I will be happy to know!
Did anyone used this product?
See the link of the company!
http://www.hyprodis.fr/A-5774-vermistop-b-contre-les-parasites-internes-chez-la-poule-canard-poulet-pigeon.aspx