Mullein Leaf Tincture is the active constituents of Verbascum extracted into ethanol. This traditional method maintains and preserves the naturally-occurring constituents found in the plant. Mullein Leaf Tincture from Indigo Herbs is derived from high quality Mullein Leaf which has a long history of traditional use as an expectorant. This herbal tincture can be added to water or fruit juice and taken when required.