Key takeaways
- Mullein is one of the longest-used herbs for chest and throat comfort.
- Saponins, mucilage and flavonoids are its three most important compound groups.
- Laboratory findings are promising; more human studies are underway in the field.
- Liquid extracts are the most convenient way to get a consistent daily serving.
- Most healthy adults tolerate mullein well.
Mullein is hard to miss once you know it. In its first year it forms a low rosette of broad, silver-green leaves that feel like soft felt. In its second year it shoots up a flower spike that can stand taller than you, dotted with small yellow blossoms. It grows almost anywhere the soil is dry and sunny, from European meadows to American roadsides.
That humble plant has earned a big reputation in respiratory wellness. Here is why.
A long history in herbal practice
Old European herbal texts recommend mullein leaves for "the chest" again and again, usually as a warm infusion sipped during coughing spells. Some traditions even rolled the dried leaves and smoked them for chest relief. When European settlers reached North America they brought mullein with them, and it spread quickly into local folk medicine. Herbalists still describe it with two classic labels: expectorant, helping to bring up phlegm, and demulcent, soothing irritated surfaces.
What's actually in the leaf
Mullein's reputation rests on a few natural compound families:
Saponins
Soap-like plant molecules that froth in water. They are the compounds most often credited with mullein's ability to help thin and move thick mucus.
Mucilage
A water-loving fibre that turns smooth and slippery, coating a dry or tickly throat much like honey does.
Flavonoids and iridoids
Antioxidant compounds, including aucubin and catalpol, that have shown calming, anti-inflammatory activity in lab experiments.
What the research shows so far
Researchers have tested mullein extracts in the laboratory and found antioxidant, anti-inflammatory, antibacterial and antiviral effects. It was also one of the herbs in a naturopathic ear-drop formula studied in children. The next step scientists are working toward is larger human studies measuring breathing outcomes from mullein by itself.
How people use mullein
| Form | How it's used | Tip |
|---|---|---|
| Tea | 1–2 teaspoons of dried leaf steeped in hot water | Strain well through cloth or a paper filter to remove fine leaf hairs. |
| Liquid extract / drops | A dropper serving taken directly or in water | Quick, travel-friendly and easy to measure every day. |
| Capsules | Ground dried leaf in a capsule | No taste, but usually needs several capsules per day. |
Safety first
Mullein has a strong safety record for healthy adults. Handling fresh leaves can cause mild skin itching in sensitive people. There is limited research during pregnancy and breastfeeding, so check with your doctor first in those situations or if you take prescription medication.
If you have a cough that won't go away, feel short of breath, wheeze or notice blood when you cough, see a healthcare professional to find out what is behind it.
Sources
- Cleveland Clinic – "Mullein: Benefits and Side Effects." health.clevelandclinic.org/mullein-benefits
- Turker AU, Gurel E. "Common mullein (Verbascum thapsus L.): recent advances in research." Phytotherapy Research, 2005.
- Mahdavi S, et al. "Antioxidant and antibacterial activity of Verbascum species." Journal of Medicinal Plants, 2020.
- Sarrell EM, et al. "Naturopathic treatment for ear pain in children." Pediatrics, 2003.
Common questions
Is mullein good for a cough?
Mullein has been used for centuries to comfort the chest and throat during coughs. Its saponins may help loosen mucus and its mucilage soothes throat irritation.
What form of mullein is easiest to take?
Liquid extracts are the most convenient for daily use because they are quick to take and easy to measure consistently.
Does mullein have side effects?
Mullein is well tolerated by most healthy adults. Fresh leaves may irritate sensitive skin, and pregnant or breastfeeding people should ask a doctor first.