e200921c_sity_of_Michigan_Health_System__Why
[Supplement] 1 Star Mullein Refer to label instructions [Why] 
Mullein has soothing and mucus-expelling properties, which accounts for its historical use as a remedy for irritating coughs with bronchial congestion. Herbs high in mucilage, such as slippery elm, mallow (Malvia sylvestris), and marshmallow, are often helpful for symptomatic relief of coughs and irritated throats. Mullein has expectorant and demulcent properties, which accounts for this herb’s historical use as a remedy for the respiratory tract, particularly in cases of irritating coughs with bronchial congestion. Coltsfoot is another herb with high mucilage content that has been used historically to soothe sore throats. However, it is high in pyrrolizidine alkaloids—constituents that may damage the liver over time. It is best to either avoid coltsfoot or look for products that are free of pyrrolizidine alkaloids.
Common Cold/Sore Throat (Holistic) | University of Michigan Health System
Why