I don't know about anyone else, but I can't stand the smell or after effects of Guaiacol in my gear and I'm allergic to it as well. I just re-ordered 15 vials of a special blend and i understand it was brewed by a different guy this time, but the seller needs to know that the first guy didn't use guaiacol and the second guy did. I got my 15 vials and you could literally smell the pack from 5 feet away. Killed my office to where if I was in there, I was sneezing and got a headache. Now, the guy I got the blend from is cool and we are swapping them out, so all is good. My point is, AS A VENDOR, PLEASE PUT ON YOUR LIST THAT YOU USE GUAIACOL NEXT TO THE PRODUCTS THAT IT'S IN. Yes as a customer I'm going to shy away from those on your list, but at least we don't have to go through the heartache of me not knowing and being surprised when it arrives. That is all, Carry On.