Mullein tea is a caffeine-free herbal beverage known for its sedative and astringent properties. This herbal tea is made from the leaves of the flowering plant mullein (Verbascum thapsus). Mullein benefits are several due to its antioxidant, antibacterial, and antiviral properties. Mullein tea is a decoction & its intake may help treat many respiratory conditions, fight viral infections, relieve sleeping issues & aid tuberculosis treatment.