You're right, there are many imitiations out there. I use Oil of Oregano P73 from The Vitamin Shoppe. It is wild mediterranean Oregano Oil. I am so excited about this and I hope that it works for you. I got outbreaks every 3 weeks like clockwork and haven't had one in over 2 months (which is how long I've been using this) I used to get nervous about when the next outbreak would come and now I have a peace with in me and I can't tell you how good that feels. I haven't had a peaceful feeling in 2 years (which is when I got it) I took more than the bottle recommended. I followed Dr. Cass Ingram's book.
Let me know how you do! I'm excited for you because I really think this is an amazing thing!