I have had my chickens for about 9 months. I have been thinking about worming them just because. My wife works at a vets office, and she is taking in a fecal sample to check it. I have seen a lot of post on BYC about Jeffers Livestock, and Valbazen. I went to there site, and they have a product called Wormguard. Is the Wormguard worth it?