Neither had I. I bought it on the advice of a friend who uses it for his mother who has COPD. I actually spent an hour trying to find it. Forgot where I put it. Found it, tested it on myself before treating the misses. Had to make sure I was doing it right. I read in several places it kills the viral load in the sinuses, nose, throat, and lungs. I am not a doctor, and this is not medical advice. Just discussion