Plant Profile

Horehound

Marrubium vulgare
Family: Lamiaceae  ·  Parts used: Aerial parts (flowering herb)  ·  Also known as: White horehound, Common horehound

The complete database record: 3 documented constituents, 5 pharmacological actions, 10 traditional / indicated uses, with 15 cited sources.

Botanical Description

Perennial herb, 20-60 cm tall, with square, densely white-woolly (tomentose) stems characteristic of the mint family. Leaves are opposite, ovate-rounded, crinkled and coarsely toothed, grey-green and woolly beneath, with a strong bitter, slightly musky smell when crushed. Small white, two-lipped flowers are clustered in dense whorls (verticillasters) in the leaf axils up the stem. The fruit splits into four small nutlets typical of the Lamiaceae.[11]

Height: 20-60 cm
Habit: Erect, bushy, white-woolly perennial herb
Leaves: Opposite, ovate-rounded, crinkled, coarsely toothed, woolly beneath
Flowers: Small, white, two-lipped, in dense axillary whorls (verticillasters)
Stem: Square, densely white-woolly (tomentose)
Root: Fibrous perennial rootstock
Fruit: Four small nutlets (typical Lamiaceae schizocarp)
Flowering Period: June-October

Habitat & Distribution

Native to Europe, North Africa and temperate Asia and widely naturalised elsewhere, growing on dry, disturbed, sunny ground - roadsides, waste places, pastures and rocky or sandy soils.[8, 11]

Harvesting

The flowering aerial parts are cut during the flowering season (summer), when bitter marrubiin content is highest, and dried promptly out of direct sunlight; harvest site and season measurably affect the marrubiin and antioxidant content of the dried herb.[8, 11]

Parts: Aerial parts
Season: Summer, during flowering

Key Constituents

Labdane diterpene marrubiin[11, 12, 13]

The characteristic bitter principle (pharmacopoeial material contains at least 0.7%); drives the expectorant and digestive actions. A phytochemical/pharmacological overview identifies marrubiin and the phenolic fraction as the basis for antioxidant, anti-inflammatory and antimicrobial activity.

Terpenes / terpenoids
Flavonoids and phenylethanoid esters (e.g. verbascoside)[11, 12]

Antioxidant and anti-inflammatory constituents.

Verbascoside (acteoside)Flavonoids
Tannins and volatile oil[12]

Astringent and aromatic constituents of the herb.

Essential (volatile) oilTannins

Pharmacological Actions

Anticancer (preclinical)[15]
Antispasmodic[6, 12]

Antispasmodic (traditional use in whooping cough)

Bitter digestive tonic / stomachic[11]

Bitter digestive for dyspeptic complaints (indigestion, bloating, flatulence) and loss of appetite

Digestive aid[11]

Bitter digestive for dyspeptic complaints (indigestion, bloating, flatulence) and loss of appetite

Expectorant[2, 7, 11, 12]

Expectorant for productive cough and catarrh of the upper respiratory tract / bronchitis

Traditional & Indicated Uses

Loss of appetite[2, 11]Preliminary · 1/10

Bitter digestive for dyspeptic complaints (indigestion, bloating, flatulence) and loss of appetite

Evidence: 1
Label: Loss of appetite

more plants for loss of appetite →detailed sources →

Bloating[11]Preliminary · 1/10

Bitter digestive for dyspeptic complaints (indigestion, bloating, flatulence) and loss of appetite

Evidence: 1
Label: Bloating

more plants for bloating →detailed sources →

Bronchitis[2, 7, 11, 12]Preliminary · 2/10

Expectorant for productive cough and catarrh of the upper respiratory tract / bronchitis

Evidence: 2
Label: Bronchitis

more plants for bronchitis →detailed sources →

Cancer (anticancer research)[15]Preliminary · 2/10

inferred from anticancer action

Evidence: 2
Label: Cancer (anticancer research)

more plants for cancer (anticancer research) →detailed sources →

Cough[2, 11, 12]Preliminary · 1/10

Antispasmodic (traditional use in whooping cough); Expectorant for productive cough and catarrh of the upper respiratory tract / bronchitis

Evidence: 1
Label: Cough

more plants for cough →detailed sources →

Indigestion[2, 11]Preliminary · 1/10

Bitter digestive for dyspeptic complaints (indigestion, bloating, flatulence) and loss of appetite

Evidence: 1
Label: Indigestion

more plants for indigestion →detailed sources →

Menstrual cramps[12]Preliminary · 1/10

inferred from antispasmodic action

Evidence: 1
Label: Menstrual cramps

more plants for menstrual cramps →detailed sources →

Muscle spasm[6, 12]Preliminary · 2/10

inferred from antispasmodic action

Evidence: 2
Label: Muscle spasm

more plants for muscle spasm →detailed sources →

Respiratory support[2, 7, 11, 12]Preliminary · 2/10

inferred from expectorant action

Evidence: 2
Label: Respiratory support

more plants for respiratory support →detailed sources →

Sore throat[11, 12]Preliminary · 1/10

Soothes sore throat (traditional)

Evidence: 1
Label: Sore throat

more plants for sore throat →detailed sources →

Traditional Use & History

White horehound has a long European and Mediterranean folk-medicine history as a bitter expectorant for coughs, bronchitis and catarrh, and as a digestive bitter for poor appetite and dyspepsia. It is one of the classic ingredients of traditional cough syrups and horehound candy. A modern critical review found reasonable, though not conclusive, scientific support for these traditional respiratory and digestive uses.[2, 11, 12]

Preparations

Infusion[11]

Dried aerial parts steeped in hot water as a bitter digestive and expectorant tea.

Decoction/syrup[12]

A stronger decoction, traditionally sweetened into a syrup (or made into horehound candy), for cough and sore throat.

Dosage

Infusion[11, 12]

EMA/ESCOP herbal-monograph guidance suggests about 1.5-2 g of dried aerial parts per cup, as an infusion up to 3 times daily. Educational reference only, not a prescription.

Safety, Cautions & Contraindications

Safety note[11]Caution

As a strong bitter it may aggravate hyperacidity; theoretical caution in peptic ulcer. Large amounts have shown effects on heart rhythm and blood pressure in studies, so avoid excessive intake.

Safety note[11]Caution

Traditional use only; a cough or digestive complaint that persists needs medical assessment. Use in pregnancy and breastfeeding is not recommended.

Harvest Readiness

[14]

Part: aerial-parts
Signals: Cut the flowering aerial parts (herb) as the plant comes into flower, from early summer.
Basis: traditional
Source Quote: The plant is harvested as it comes into flower and can be used fresh or dried.
Species Confirmed: 1
Notes: PFAF (REF-3288); the flowering herb is cut as it comes into flower (long flowering June-November). Single lineage -> provisional.

External Identifiers

References & Sources

  1. Lazarova, M.I., Tsvetanova, E.R., Georgieva, A.P., Stefanova, M.O. and others (2024) 'Marrubium vulgare Extract Improves Spatial Working Memory and Oxidative Stress Damage in Scopolamine-Treated Rats', Journal of Alzheimer's Disease, 99(s1), pp. S157-S169. doi:10.3233/JAD-231011 Preclinical
    https://doi.org/10.3233/JAD-231011
  2. Rodriguez Villanueva, J. and Martin Esteban, J (2016) 'An Insight into a Blockbuster Phytomedicine; Marrubium vulgare L. Herb. More of a Myth than a Reality?', Phytotherapy Research, 30(10), pp. 1551-1558. doi:10.1002/ptr.5661 Traditional / reference
    https://doi.org/10.1002/ptr.5661
  3. Acimovic, M., Ivanovic, S., Simic, K., Pezo, L. and others (2021) 'Chemical Characterization of Marrubium vulgare Volatiles from Serbia', Plants (Basel), 10(3), pp. 600. doi:10.3390/plants10030600 Preclinical
    https://doi.org/10.3390/plants10030600
  4. Amri, B., Martino, E., Vitulo, F., Corana, F. and others (2017) 'Marrubium vulgare L. Leave Extract: Phytochemical Composition, Antioxidant and Wound Healing Properties', Molecules, 22(11), pp. 1851. doi:10.3390/molecules22111851 Preclinical
    https://doi.org/10.3390/molecules22111851
  5. Lazarova, M., Stefanova, M., Denev, P., Taseva, T. and others (2024) 'Neuroprotective Effect of Marrubium vulgare Extract in Scopolamine-Induced Cognitive Impairment in Rats: Behavioral and Biochemical Approaches', Biology (Basel), 13(6), pp. 426. doi:10.3390/biology13060426 Preclinical
    https://doi.org/10.3390/biology13060426
  6. Aitbaba, A., Kabdy, H., Baslam, A., Azraida, H. and others (2024) 'Chemical Investigation and Antinociceptive Activity Evaluation of Marrubium vulgare L. Aqueous Extract', Chemistry & Biodiversity, 21(5), pp. e202400228. doi:10.1002/cbdv.202400228 Preclinical
    https://doi.org/10.1002/cbdv.202400228
  7. Abidi, A., Dhaouafi, J., Brinsi, C., Tounsi, H. and Sebai, H (2022) 'Tunisian Horehound (Marrubium vulgare) Aqueous Extract Improves Treatment of Bleomycin-Induced Lung Fibrosis in Rat', Dose-Response, 20(3), pp. 15593258221119300. doi:10.1177/15593258221119300 Preclinical
    https://doi.org/10.1177/15593258221119300
  8. Rezgui, M., Basma, M., Neng, N., Nogueira, J.M. and others (2021) 'Evaluation of Marrubium vulgare Growing Wild in Tunisia for Its Potential as a Dietary Supplement', Foods, 10(11), pp. 2864. doi:10.3390/foods10112864 Preclinical
    https://doi.org/10.3390/foods10112864
  9. Gourich, A.A., Touijer, H., Drioiche, A., Asbabou, A. and others (2023) 'Insight into biological activities of chemically characterized extract from Marrubium vulgare L. in vitro, in vivo and in silico approaches', Frontiers in Chemistry, 11, pp. 1238346. doi:10.3389/fchem.2023.1238346 Preclinical
    https://doi.org/10.3389/fchem.2023.1238346
  10. Yousefi, K., Hamedeyazdan, S., Torbati, M. and Fathiazad, F (2016) 'Chromatographic Fingerprint Analysis of Marrubiin in Marrubium vulgare L. via HPTLC Technique', Advanced Pharmaceutical Bulletin, 6(1), pp. 131-136. doi:10.15171/apb.2016.019 Preclinical
    https://doi.org/10.15171/apb.2016.019
  11. European Medicines Agency (HMPC) (2013) 'European Union herbal monograph on Marrubium vulgare L., herba (Marrubii herba)'. Available at: https://www.ema.europa.eu/en/medicines/herbal/marrubii-herba Traditional / reference
    https://www.ema.europa.eu/en/medicines/herbal/marrubii-herba
  12. ESCOP (European Scientific Cooperative on Phytotherapy) (n.d.) 'Marrubii herba (White Horehound) monograph', pp. com. Available at: https://www.escop.com/downloads/white-horehound/ Traditional / reference
    https://www.escop.com/downloads/white-horehound/
  13. Acimovic, M., Jeremic, K., Salaj, N., Gavaric, N., Kiprovski, B., Sikora, V. and Zeremski, T (2020) 'Marrubium vulgare L.: A Phytochemical and Pharmacological Overview', Molecules, 25(12). doi:10.3390/molecules25122898 Meta-analysis / review
    https://doi.org/10.3390/molecules25122898
  14. Plants For A Future 'Marrubium vulgare (White Horehound)'. Available at: https://pfaf.org/user/Plant.aspx?LatinName=Marrubium+vulgare Traditional / reference
    https://pfaf.org/user/Plant.aspx?LatinName=Marrubium+vulgare
  15. Yamaguchi, K., Liggett, J.L., Kim, N.C. and Baek, S.J (2006) 'Anti-proliferative effect of horehound leaf and wild cherry bark extracts on human colorectal cancer cells', Oncology Reports, 15(1), pp. 275-281. doi:10.3892/or.15.1.275 Preclinical
    https://doi.org/10.3892/or.15.1.275

This fact sheet is generated automatically from the Omnia Sana plant database and reflects its latest synced data. It is provided for educational purposes only and is not medical advice. How this site is built.

Selected studies & references

Educational use only. This profile summarises traditional and scientific sources for reference. It is not medical advice and not a substitute for a qualified practitioner. Some plants carry safety cautions and drug interactions - always check before use.
This profile is assembled automatically from the Omnia Sana plant database, which we curate by hand. How this site is built.
← Browse all plants