Research note
Mullein leaf extract 10:1: how much Breathizen can hold, and what the research does and does not show
Mullein comes first in the 154 mg blend, so each serving holds at least 51.3 mg of it. The plant has a long folk record for coughs, a handful of lab studies, and no published human trial on lung function.
The plant behind the first line of the blend
Common mullein, Verbascum thapsus, is the tall roadside plant with soft, felted grey leaves and a spike of yellow flowers. Herbal traditions in Europe and North America have used its leaves and flowers for coughs and chest complaints for centuries, usually as a tea or an infused oil [1, 2]. The plant contains mucilage, saponins, iridoid glycosides such as aucubin, flavonoids and the phenylethanoid verbascoside, which is the compound most often studied in the lab [3].
Breathizen lists "Mullein (Verbascum thapsus)(leaf) Extract 10:1" first in its blend. The leaf is named explicitly, which matters, because the best-documented traditional preparation in Europe uses the flower rather than the leaf.
What 10:1 tells you, and what it leaves out
A 10:1 figure is a drug-to-extract ratio: roughly ten parts of dried leaf were processed to make one part of finished extract. It describes concentration by mass. It does not tell you which solvent was used, whether the extract was standardized to any marker compound, or how much verbascoside or mucilage survived the process. Two 10:1 extracts from different suppliers can differ widely in chemistry.
The ratio does let you estimate a leaf equivalent. If every one of the 154 mg in the blend were mullein, which the label rules out, the serving would correspond to about 1.5 g of dried leaf. The real figure is lower, because ginger and lemon share the weight.
How much mullein can be in one serving
The proprietary blend rule requires ingredients to be listed in descending order by weight. Mullein is first of three, so it must weigh at least as much as each of the other two. That sets a floor and a ceiling:
| Quantity | Arithmetic | Result |
|---|---|---|
| Mullein floor | 154 mg divided by 3 (all three equal) | at least 51.3 mg |
| Mullein ceiling | Just under the full blend | below 154 mg |
| Leaf equivalent at the floor | 51.3 mg x 10 | about 0.5 g dried leaf |
| Leaf equivalent near the ceiling | 154 mg x 10 | about 1.5 g dried leaf |
| Mullein per bottle, floor | 51.3 mg x 100 servings | about 5.1 g extract |
Our blend arithmetic note shows the same reasoning for all three extracts, and the label page prints the panel this math starts from.
What the research on mullein actually covers
Here is the honest ledger. Each row is a real record; read the "model" column before the "finding" column.
| Record | Model | Finding | Bearing on a lung spray |
|---|---|---|---|
| Turker and Camper 2002 [4] | Lab dishes | Mullein extracts inhibited several bacteria | Indirect; no human airway data |
| Speranza 2010 [5] | Human monocyte cell line | Verbascoside damped inflammatory signals | Cell biology only |
| Escobar 2012 [6] | Cell culture | Leaf extract slowed a pig herpesvirus | Far from human colds |
| Sarrell 2001 [7] | Children with ear infections | Herbal ear drops containing mullein eased ear pain | Ear canal, mixed herbs; not lungs |
| EMA mullein flower monograph [8] | Traditional use review | Accepted for cough with colds on long use | Flower, not the leaf used here |
We found no human trial of mullein leaf extract measuring lung function, breathing comfort or mucus clearance. The sales page phrase about loosening mucus "accumulated in the lungs" therefore rests on tradition and lab work, not on clinical results.
Tolerability and who should pause
Mullein has a long record of use as a tea with few reported problems, and reviews describe it as generally well tolerated [1, 3]. The fine hairs on dried leaves can irritate the throat, which is why teas are strained; that concern does not apply to a filtered liquid extract. Allergy to plants in the figwort family is possible, so stop if your mouth itches or swells.
The label itself asks pregnant or nursing women, anyone under 18 and anyone with a medical condition to check with a physician first, and that applies to every line of the blend. The safety page lists the full set of cautions.
Questions buyers ask here
How much mullein is in one Breathizen serving?
At least 51.3 mg and less than 154 mg of 10:1 leaf extract. The label does not print the exact figure, so that range is all the descending-order rule allows anyone to calculate.
Does mullein clear mucus from the lungs?
No human study has shown that. Mullein's reputation for coughs comes from traditional use and lab chemistry; the strongest regulatory recognition covers the flower as a traditional remedy for cough with colds.
Is taking mullein every day safe?
Traditional use suggests it is generally well tolerated, but long-term daily use of a leaf extract has not been studied in trials. Follow the label caution and ask a clinician if you have a condition or take medicines.
Sources linked from this page
Each link opens the original record. The studies tested single ingredients at their own doses and routes; none of them tested the Breathizen spray or its 154 mg blend.
- 1Turker AU, Gurel E. Common mullein (Verbascum thapsus L.): recent advances in research. Phytother Res. 2005;19(9):733-739. pubmed.ncbi.nlm.nih.gov/16222647/
- 2Blanco-Salas J, Hortigón-Vinagre MP, Morales-Jadán D, Ruiz-Téllez T. Searching for scientific explanations for the uses of Spanish folk medicine: a review on the case of mullein (Verbascum, Scrophulariaceae). Biology (Basel). 2021;10(7):618. pubmed.ncbi.nlm.nih.gov/34356473/
- 3Gupta A, Atkinson AN, Pandey AK, Bishayee A. Health-promoting and disease-mitigating potential of Verbascum thapsus L. (common mullein): a review. Phytother Res. 2022;36(4):1507-1522. pubmed.ncbi.nlm.nih.gov/35088467/
- 4Turker AU, Camper ND. Biological activity of common mullein, a medicinal plant. J Ethnopharmacol. 2002;82(2-3):117-125. pubmed.ncbi.nlm.nih.gov/12241986/
- 5Speranza L, Franceschelli S, Pesce M, et al. Antiinflammatory effects in THP-1 cells treated with verbascoside. Phytother Res. 2010;24(9):1398-1404. pubmed.ncbi.nlm.nih.gov/20812283/
- 6Escobar FM, Sabini MC, Zanon SM, Tonn CE, Sabini LI. Antiviral effect and mode of action of methanolic extract of Verbascum thapsus L. on pseudorabies virus (strain RC/79). Nat Prod Res. 2012;26(17):1621-1625. pubmed.ncbi.nlm.nih.gov/21999656/
- 7Sarrell EM, Mandelberg A, Cohen HA. Efficacy of naturopathic extracts in the management of ear pain associated with acute otitis media. Arch Pediatr Adolesc Med. 2001;155(7):796-799. pubmed.ncbi.nlm.nih.gov/11434846/
- 8European Medicines Agency, Committee on Herbal Medicinal Products. Verbasci flos (mullein flower): herbal medicinal product summary and monograph. www.ema.europa.eu/en/medicines/herbal/verbasci-flos
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