About Common Mullein
Verbascum thapsus leaf has traditional use as a respiratory demulcent and expectorant for cough, bronchitis, and sore throat. Contains mucilage, saponins (verbascosaponins), iridoid glycosides (aucubin), and flavonoids. Mechanistic and in-vitro data suggest mild antibacterial, antiviral (influenza, HSV), and anti-inflammatory activity. No high-quality modern RCTs in healthy adults for any indication. Generally considered safe; raw leaf hairs can irritate mucosa, so preparations are typically strained/filtered. Pregnancy data is lacking — avoid. Distinct from 'mullein oil' (ear drops), which is a separate ethnobotanical use.
What Common Mullein supports
- Traditional respiratory remedy — no modern RCTs support cough or airway claims
- Mucilage may coat mucous membranes — clinical effect on cough not demonstrated
How much Common Mullein to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
300–1500
mg
No clinically validated dose. Traditional herbalism uses 3–4 g dried leaf as tea or 300–1500 mg/day in capsule form. Range is folk/monograph-derived, not RCT-derived.
Clinical evidence
Limited clinical evidence. Traditional and folk use only; no published RCTs of meaningful size. Evidence is mechanistic and ethnobotanical.
Reference