There are two groups of people reference worming chickens; those who do it routinely every six months or so, just as a precaution or due to location where worms are prevalent, and those like myself who have never wormed their chickens or only do it when they are visibly noticeable or a fecal test proves they have worms.I will for sure get something to deworm them though.
This is another product I do not stock, but if ever needed, I can get some only a few miles away.