Cough and Soar Throat.
Mullein contains a substance called mucilage, which swells & becomes slippery as it absorbs water. This probably accounts for its soothing action on the throat.
Contemporary herbalists recommend mullein internally for coughs, colds, sore throat, and other respiratory complaints, and externally in a hot vinegar compress for hemorrhoids.
For an infusion that can help soothe cough and sore throat and that may help treat diarrhea, use 1 to 2 teaspoons of dried leaves, flowers, or roots per cup of boiling water. Steep 10 minutes. Drink up to 3 cup a day. Mullein tast bitter; add sugar, honey, and lemon, or mix it into an herbal beverage blend to improve flavor.