What Is Mullein Tea Good for? Health Benefits and Side Effects Puffiair Diffuser Pen Natural Mullein Leaf Aromatherapy Inhaler Lung Cleanser Herbal Mullein Diffuser Pen and Puffiair price What's the Best Form of Mullein Extract? Betterbrand Mullein (pronounced mull in) is a tall, flowering plant that grows in many parts of the U.S. and Europe that has been used in herbal medicine since ancient times. People who have been