Like you I've read a lot about mullein and decided to buy a bag of loose mullein tea. I sip it in the morning to lubricate my throat during airway clearance. I finish the cup after clearance. I've used it now for about 3-4 weeks and cannot say it has made a big difference one way or another. It's tastes earthy so I add honey. Have you seen a recommended dose? Maybe I'm not drinking enough of it. All I know so far is that you should leave some liquid in the bottom of the cup (not finish the whole cup) as there are microscopic prickly things which fall to the bottom of the cup that can be irritating to the throat.