Horehound

Botanical

What is it

Horehound (Marrubium vulgare) is a flowering plant in the mint family, traditionally used as an expectorant and bitter digestive aid. Horehound candies were historically used for sore throat and cough.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Cough / sore throat (traditional use)

Mixed Evidence

Long traditional use, but rigorous modern evidence is sparse. Horehound was previously included in FDA-approved OTC cough remedies but was later removed due to insufficient efficacy evidence.

How it works

Horehound contains the diterpene marrubiin (and its precursor premarrubiin), flavonoids, and volatile oils. Marrubiin is bitter and is proposed to stimulate gastric secretion and bronchial secretion. Traditional and folk uses include cough relief, indigestion, and bile flow stimulation. Modern clinical evidence is limited. Some preliminary studies suggest possible benefits for blood sugar and inflammation, but rigorous human trials are scarce.

Dosage

No established RDA. Traditional doses are 1-2 g of dried herb as a tea, or 1-2 ml of tincture, 2-3 times daily.

When and how to take it

WHEN: 2-3 times daily during use. HOW: As a tea, tincture, or lozenge.

2 commercial forms

Compare the main delivery options and what they’re best suited for.

Dried herb / tea

Traditional preparation.

Marrubiin and bitter components extracted by hot water.

Lozenges / candies

Historical use for sore throat.

Provides direct contact with throat tissues.

Safety

Generally safe at traditional doses. Side effects can include GI upset and (rarely) arrhythmia at very high doses (marrubiin has cardiac effects in animals). Allergic reactions are possible in mint-family-sensitive individuals.

Who should be cautious

Avoid during pregnancy (traditional contraindication). Use cautiously with cardiac arrhythmias, diabetes medications, and hypertension treatment. Limited data in breastfeeding.

Interactions

Theoretical interactions with antiarrhythmic medications and antidiabetic drugs. May enhance effects of antihypertensives.

Frequently asked questions

Is horehound the same as the candy?⌄

Traditional horehound candy is flavored with horehound extract. The amount of active compound varies; modern 'horehound' candy may have very little actual herb.

References

Horehound on Wikidata — Wikidata link

Horehound on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Horehound (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.