Mullein is an expectorant, which means it helps the body expel excess mucus, usually by helping make your coughs more productive, to bring up mucus that may be settling in the chest or in the throat. It is also a demulcent. Studies show that demulcents create a soothing anti-inflammatory coating over mucous membranes. Mullein is a supreme, safe, and profound respiratory tonic. It helps open the lungs, eases spasms, tightness, and cough, and soothes irritation and dryness.