I had a serious chest cough that triggered my asthma and after 2 days felt myself sinking into sleepless nights and concern of the usual secondary infection. I had actually intended to purchase Oreganol when I found this supplement. After the first 2 capsules I felt the pressure in my chest let up some. I slept that night with virtually no coughing but it continued during the day. While altering my diet by eliminating most sugars, yeast and dairy products, I took 4-5 capsules daily. After about 4 more days my symptoms were gone. It's worth a try for those who suffer from respiratory ailments, I think. Good luck!