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Respiratory Health250 mg Per CapsuleStandardizedHerbal SupplementTraditionally Used to Support Respiratory HealthMay Help Support Healthy Mucus MembranesSource of Antioxidants for Overall WellbeingScience-Backed Quality Since 1969Swanson Mullein Leaf Extract capsules contain a standardized 4:1 extract of pure mullein leaf. Dioscorides the ancient Greek pharmacologist who wrote the original Materia Medica is believed to be the first to employ this herb traditionally used for respiratory support. This remains its primary use today and herbalists from China to California still recommend it just as Dioscorides did over 2 000 years ago.