Many uses.
Just don't confuse it with foxglove (
Digitalis sp.), as the yellow strains of foxglove can grossly resemble mullien.
This misunderstanding is unlikely with people who really know plants, but--if you're a newbie--a misunderstand of the distinction between these two plants could be fatal.
Foxglove contains a powerful heart stimulant that can kill you . . . or leave you with permanant heart damage.
See below for pictures of the yellow strain of foxglove:
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Ironically (despite my dire warnings), foxglove can be a life-saving drug for people with heart problems.
If you've ever heard of the drug Lanoxin--which is used in atrial fibrillation and/or congestive heart failure--it is the active substance in foxglove.
This might push some people toward using foxglove tea as a substitute for perscription meds, but this is very, very dangerous.
The concentration of digitalis in each leaf can be variable, so there's no telling how strong the tea might be.
So . . . don't go there unless you're an experienced herbalist and/or biochemist . . . in which case, this post is superfluous anyway.