I got the Oregano from bio-alternatives.net. It cost 23.99 for a 2 oz bottle. It is 85% Carvacrol from Turkey I think, but it was diluted with Olive-Oil and I can't find our the ratio. The source Wrenn suggested sounds better, but I don't know how to take pure Oregano OIl. With the stuff I got I just put a few drops under my tongue every hour or so. I would like to try some of MH's dewormer too someday.