Every source you will read on mullein says the same thing, that the human evidence is limited. None says how limited, so here it is: 148 papers and 3 trials.
PubMed holds 148 records on this plant and exactly 3 clinical trials. Not 1 of the 3 tested mullein for lungs.
Quick Answer: What Is Mullein Leaf?
Mullein leaf is the dried leaf of Verbascum thapsus, a tall flowering plant traditionally used for the throat, chest and skin. PubMed holds 148 records on it, of which 31 are tagged human and exactly 3 are clinical trials. Two of those 3 tested a 4-herb ear drop and the third tested a topical dressing in 93 women. That leaves 0 trials of mullein taken by mouth for breathing.
Key Takeaways
- Mullein leaf comes from Verbascum thapsus, 1 plant with a long traditional record.
- PubMed holds 148 mullein records and exactly 3 clinical trials.
- In 2 of those 3 trials mullein was 1 of 4 herbs.
- 16 records mention breathing, and 0 of them are clinical trials.
- The leaf carries fine hairs, so 1 straining step is not optional.
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What It Actually Is
Mullein is a tall biennial plant with soft, felted leaves, and the supplement is made from those leaves dried.
- Botanical name: Verbascum thapsus.
- Origin: Northern Africa, western and central Asia and Europe.
- Where it grows now: Naturalised across the Americas and Australia.
- Part used: The leaves, dried.
- Our capsule: 1000 mg of mullein leaf.
A 2022 review describes its long use for lung, skin and throat complaints, particularly as an astringent and calming agent.[1]Health-promoting and disease-mitigating potential of Verbascum thapsus L. (common mullein): A review — Phytotherapy Research (2022) View source The word doing the work there is used, not shown. Far more people meet it as a drink than as a capsule, which is covered in mullein tea and how to brew it.
The Number That Frames Everything
Search PubMed for this plant and the shape of the evidence becomes obvious in about a minute.
| What PubMed holds on mullein | Count |
|---|---|
| Records mentioning Verbascum thapsus or mullein | 148 |
| Records tagged as human | 31 |
| Randomized or clinical trials | 3 |
| Records mentioning cough, bronchitis, asthma, COPD or respiration | 16 |
| Clinical trials of mullein for any of those | 0 |
One hundred and forty-eight papers and 3 trials is the honest state of it. Sixteen papers mention breathing and not 1 of those 16 is a trial, which is the single most useful fact on this page. Whether that matters for you is taken apart in whether it does anything for your lungs.
The 3 Human Trials, Named
Because there are only 3, they can simply be listed rather than summarised vaguely.
| The 3 human trials | What was tested | Route |
|---|---|---|
| Ear pain, 2001 | A 4-herb oil with garlic, mullein, calendula and St John's wort | Ear drops |
| Ear pain, 2003 | The same 4-herb oil, in children | Ear drops |
| Episiotomy healing, 2021 | Mullein alone, in 93 women | Topical |
The 2 ear-pain trials trialled Otikon, an oil containing garlic, mullein, calendula and St John's wort, against anaesthetic drops in children with earache.[2]Efficacy of naturopathic extracts in the management of ear pain associated with acute otitis media — Archives of Pediatrics and Adolescent Medicine (2001) View source Mullein was 1 ingredient of 4, the endpoint was ear pain, and nothing was swallowed.
- What was tested: Ear pain in children aged 6 to 18.
- Herbs in the drop: 4, of which mullein was 1.
- Route: Topical, into the ear canal.
- What it cannot show: Anything about swallowing mullein.
The third trial is the only one of mullein on its own. It randomised 93 first-time mothers and measured episiotomy wound healing.[3]The effect of the Verbascum Thapsus on episiotomy wound healing in nulliparous women: a randomized controlled trial — BMC Complementary Medicine and Therapies (2021) View source A topical obstetric dressing is a real trial, and it is not evidence about your chest.
The separate question smokers bring to this plant is taken up in the question smokers ask.
What the Chemistry Shows
The modern literature on mullein is almost entirely chemistry, and it is genuinely interesting chemistry that has simply never left the dish.
- Compound classes: Sesquiterpenes, flavonoids, saponins and lignins.
- Recent additions: Phenolics, tannins, daidzein and ellagic acid.
- How tested: DPPH assays, LC-MS profiling and bacterial cultures.
- Where tested: In vitro, in every one of these papers.
A 2021 analysis measuring antioxidant activity noted plainly that there is not much data in this respect.[4]The Antioxidant, Anticarcinogenic and Antimicrobial Properties of Verbascum thapsus L. — Medicinal Chemistry (2021) View source A 2026 profile of Himalayan mullein was still working at the same stage, identifying constituents rather than testing people.[5]Metabolic Profiling, Antioxidant, and Antibacterial Potential of Himalayan Verbascum thapsus L. — Chemistry and Biodiversity (2026) View source
The Traditional Record
Traditional use is broad and old, and it is worth reading as history rather than as a result.
- Spanish folk medicine: Used for muscles, bones, circulation, digestion and the respiratory system.
- Species catalogued: 10 Verbascum species in the Spanish inventory.
- What reviewers conclude: A potential anti-inflammatory action.
- What that is not: A demonstrated effect in a person.
A 2024 review went looking for scientific explanations behind those folk uses and settled on the word potential.[6]Searching for Scientific Explanations for the Uses of Spanish Folk Medicine: A Review on the Case of Mullein — Biology (2024) View source Centuries of use tell you people valued the plant. They do not tell you it worked.
One Warning Before You Go Picking
Mullein grows wild across the United States and a great deal of content encourages readers to harvest it. There is a specific reason we do not.
- The look-alike: A first-year mullein rosette resembles a first-year foxglove rosette.
- Why that matters: Foxglove is Digitalis, and it is cardiotoxic.
- Our position: We sell the dried leaf and we do not publish foraging instructions.
This is the one piece of practical safety information most mullein articles leave out, and it is the one with the worst downside if you get it wrong.
Who Might Actually Want It
On an evidence base this thin, the honest recommendation is narrow.
- Reasonable: Someone who likes the tea and wants a measured amount.
- Reasonable: Someone drawn to the traditional record with clear eyes about it.
- Not reasonable: Anyone hoping to treat a diagnosed lung condition.
- Not reasonable: Anyone expecting a capsule to undo years of smoking.
Sold on those terms, a 1000 mg capsule is a traditional herb honestly labelled.
See a Clinician Rather Than Reaching for a Herb If
- Pregnancy or breastfeeding, which is the one exclusion every reference source states
- A diagnosis of COPD, asthma or emphysema, where a herb does not replace an inhaler
- Shortness of breath that is new, worsening or waking you at night
- Coughing up blood, or a cough that has lasted more than 3 weeks
- Any plan to smoke the leaf, whatever the reason
Frequently Asked Questions
What is mullein leaf good for? +
Traditionally the throat, chest and skin. PubMed holds 148 records on it and 3 clinical trials, and 0 of the 3 tested those uses by mouth.
Does mullein actually help your lungs? +
16 records mention breathing and 0 of them are clinical trials. The lung reputation rests on tradition and laboratory work, not on a result in people.
What is the most effective way to take mullein? +
No trial has compared the formats, so there is no evidence-backed answer. The 2 common routes are a strained tea and a 1000 mg capsule.
Is mullein safe to take every day? +
Everyday use looks undramatic on a thin base, and 0 studies have run long term. Pregnancy and breastfeeding are the 1 firm exclusion every source states.
Are there real human studies of mullein? +
Yes, exactly 3. Two tested a 4-herb ear drop for earache and 1 tested a topical dressing in 93 women after childbirth.
Why does mullein tea need straining? +
The leaf carries fine hairs that can scratch the throat. Straining through a paper filter or muslin removes them in 1 step.
Is mullein the same as foxglove? +
No, and confusing the 2 is dangerous. A first-year mullein rosette resembles a foxglove rosette, and foxglove is cardiotoxic.
What is in mullein leaf? +
Sesquiterpenes, flavonoids, saponins and lignins, plus phenolics and tannins. All 4 of those classes were characterised in vitro.
Does the FDA approve mullein? +
No. The FDA does not review dietary supplements for effectiveness, which applies to all 60 capsules in the bottle.
How much mullein is in your capsule? +
1000 mg of mullein leaf per vegan capsule, 60 capsules per bottle, with 0 other active ingredients.
Related Reading
- Mullein Side Effects and Who Should Avoid It
- Mullein Dosage and How to Take It
- What Is the Best Herb for Lungs?
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