i am using oregano oil. it does act as a solvent, but i still have not had any problem. i am also going to cut way back on the oregano and anly use the oil with oregano occasionally and not every day. oregano is very powerful and i am coming to the conclusion that it can be overdone. i have to watch it - for years i have had the nickname, "ol' twice as much"! i have learned the hard way that if some is good, more is not necessarily better.