I’ve been using it for almost 6 weeks now and can’t say I’ve noticed any improvement. In fact I’m noticing phlegm in my throat which I never had before and I’m constantly clearing my throat now. Also, I think my o2 stats are actually lower. I called the pharmacist at DirectRx and he said it can take 12 weeks to see improvement and I should keep using it. I’m waivering between throwing in the towel now or giving it the 12 weeks to work. I just keep thinking I should be seeing some improvement by now. I have emphysema, asthma but no bronchitis. I am not on oxygen except for exercising or exhertion. Anyone else find it took the full 12 week before seeing improvement?