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Marjoram
Origanum majorana
Digestive conditions in European and Unani medicine
Marjoram's medicinal effects come from its bioactive compounds, including terpinen-4-ol, sabinene, cis-sabinene hydrate, flavonoids, and rosmarinic acid. These constituents provide carminative, antispasmodic, and mild sedative actions. Terpinen-4-ol and flavonoids relax smooth muscle in the digestive tract, easing gas and cramping. Rosmarinic acid contributes antioxidant and anti-inflammatory properties. The essential oil components modulate nervous system activity, producing calming effects. Evidence level: C, based on traditional use and pharmacological studies rather than extensive clinical trials.
Does marjoram interact with blood thinners or other medications?
Marjoram has potential blood-thinning properties and may interact with anticoagulant and antiplatelet medications such as warfarin, aspirin, and clopidogrel. Compounds in marjoram may affect platelet aggregation and increase bleeding risk. Individuals on blood-thinning medications or those with bleeding disorders should avoid medicinal doses of marjoram. Additionally, marjoram's sedative effects may enhance central nervous system depressants, including benzodiazepines, barbiturates, and sleep medications. Consult a healthcare provider before combining marjoram with prescription medications. Evidence level: C.
What is the recommended dosage for marjoram tea and supplements?
For adults, the standard medicinal dosage is 2–4 grams of dried herb prepared as a tea, taken up to three times daily. Tincture dosage is typically 2–3 mL of a 1:5 preparation. For essential oil use, always dilute 1–2 drops in a carrier oil for topical application or aromatherapy; internal use of essential oil requires professional guidance. These recommendations are based on traditional use and pharmacopoeial standards. Evidence level: Traditional. Pediatric dosing has not been established.
Is marjoram safe to take during pregnancy?
Marjoram is considered unsafe during pregnancy when taken in medicinal doses. While small culinary amounts used as a cooking herb are generally acceptable, concentrated extracts, therapeutic doses, and essential oils may stimulate uterine contractions and should be avoided. The essential oil in particular is contraindicated in pregnancy. Women who are pregnant or attempting to conceive should avoid medicinal marjoram preparations and consult a qualified healthcare provider for appropriate alternatives. Evidence level: C, based on traditional contraindications and pharmacological rationale.
What is marjoram used for in herbal medicine?
Marjoram is used traditionally in European and Unani medicine for digestive complaints, nervous tension, insomnia, respiratory infections, and headaches. As a carminative, it relieves gas, bloating, and intestinal cramping by relaxing digestive smooth muscle. Its mild sedative properties help with anxiety and sleep difficulties. Traditional applications also include migraine relief and respiratory support during infections. Marjoram is sweeter and milder than oregano, making it more suitable for gentle therapeutic use. Evidence level: C, with limited clinical validation.
PubMed-compiled information sheet
This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.
Compiled from 29 PubMed articles · model: gemma4:31b
Summary
Origanum majorana, known as sweet marjoram, is an aromatic medicinal plant from the Lamiaceae family used traditionally for various disorders and recognized for its wide range of pharmacological activities [PMID:27231340, PMID:36556347].
Background
Origanum majorana L. is an aromatic and medicinal plant distributed across Mediterranean countries, widely used both as a seasoning ingredient and for therapeutic purposes [PMID:32882360, PMID:34631774].
Traditional uses
Traditional and folklore medicine uses include the treatment of gastrointestinal, ocular, nasopharyngeal, respiratory, cardiac, rheumatologic, and neurological disorders [PMID:27231340], as well as allergies, hypertension, diabetes, stomach pain, and intestinal antispasmodic needs [PMID:32882360]. It is also locally reputed for regulating the menstrual cycle and restoring hormonal balance [PMID:25662759].
Active compounds
Chemical constituents include essential oils containing monoterpene hydrocarbons, oxygenated monoterpenes (such as terpinen-4-ol, alpha-terpineol, and gamma-terpinene), and phenolic compounds [PMID:27231340, PMID:38420828, PMID:36144869, PMID:39537771]. Specific identified compounds include arbutin, apigenin 7-O-glucoside, rosmarinic acid, salvianolic acid B, and procumboside B [PMID:40457736, PMID:42123895, PMID:34631774].
Mechanism of action
Marjoram may induce vasorelaxation via the PI3-K/eNOS/cGMP pathway [PMID:31212721]. Its antidiarrheal and antispasmodic effects are associated with calcium channel inhibitory activity [PMID:38420828]. Antifungal activity is attributed to ergosterol complexation [PMID:31621419]. In cancer cells, it may decrease viability via induction of caspase 3/7-dependent cell death and downregulation of survivin [PMID:36182733].
Clinical evidence
Evidence BPolycystic Ovary Syndrome (PCOS)
Marjoram tea significantly reduced DHEA-S and fasting insulin levels [PMID:25662759]
Evidence BParkinson's Disease
Consumption of Origanum majorana tea significantly increased superoxide dismutase (SOD) levels, indicating an effect on oxidative stress biomarkers [PMID:41052623]
Evidence DDiarrhea
Methanolic extract showed substantial inhibitory effect on diarrheal episodes in mice, with 80% protection at 400 mg/kg [PMID:38420828]
Evidence DNon-small cell lung cancer (NSCLC)
Essential oil significantly decreased cell viability in vitro and slowed tumor xenograft growth and metastasis in vivo [PMID:36182733]
Evidence DCutaneous sporotrichosis
Oral treatment with essential oil led to remission of cutaneous lesions and decreased fungal burden in systemic organs in rats [PMID:31621419]
Safety & adverse effects
While data specifically for O. majorana is limited in the provided text, related Origanum species are generally recognized as safe (GRAS) as food ingredients, though rare reports of gastrointestinal upset and allergic skin reactions exist [PMID:30000904].
Evidence summary
The evidence consists primarily of in vitro and in vivo animal studies (Level D) and small-scale randomized controlled pilot studies (Level B) in humans. There is strong preclinical evidence for antimicrobial, antioxidant, and antispasmodic activities, but limited large-scale clinical data.
2.PMID: 27231340 (2017) — Sweet Marjoram: A Review of Ethnopharmacology, Phytochemistry, and Biological Activities. · Journal of evidence-based complementary & alternative medicine
3.PMID: 36556347 (2022) — Origanum majorana Essential Oil-A Review of Its Chemical Profile and Pesticide Activity. · Life (Basel, Switzerland)
4.PMID: 32882360 (2021) — Traditional use, phytochemistry, toxicology, and pharmacology of Origanum majorana L. · Journal of ethnopharmacology
5.PMID: 40457736 (2025) — Phenolic compounds from Origanum majorana with biofilm-inhibitory activity against methicillin-resistant Staphylococcus aureus and Escherichia coli strains.
Government sources
No direct government monograph is available for this herb. The content below is AI-generated and has not been verified against an authoritative government source. Use the search links to check official sources before relying on this information.
6.PMID: 38420828 (2024) — Calcium Channel Inhibitory Effect of Marjoram (Origanum majorana L.): Its Medicinal Use in Diarrhea and Gut Hyperactivity. · Frontiers in bioscience (Landmark edition)
7.PMID: 34631774 (2021) — Origanum majorana L.: A Nutritional Supplement With Immunomodulatory Effects. · Frontiers in nutrition
8.PMID: 31212721 (2019) — Marjoram Relaxes Rat Thoracic Aorta Via a PI3-K/eNOS/cGMP Pathway. · Biomolecules
9.PMID: 42123895 (2026) — Polyphenol Diversity and Chemotype Variation in Origanum majorana and Related Species: Implications for Chemotaxonomic Differentiation, Standardisation and Genotype Selection. · Molecules (Basel, Switzerland)
10.PMID: 25662759 (2016) — The effect of marjoram (Origanum majorana) tea on the hormonal profile of women with polycystic ovary syndrome: a randomised controlled pilot study. · Journal of human nutrition and dietetics : the official journal of the British Dietetic Association
11.PMID: 36144869 (2022) — Chemical Composition, Enantiomeric Distribution, Antimicrobial and Antioxidant Activities of Origanum majorana L. Essential Oil from Nepal. · Molecules (Basel, Switzerland)
12.PMID: 36182733 (2022) — Origanum majorana essential oil decreases lung tumor growth and metastasis in vitro and in vivo. · Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie
13.PMID: 31621419 (2021) — In vivo protection of the marjoram (Origanum majorana Linn.) essential oil in the cutaneous sporotrichosis by Sporothrix brasiliensis. · Natural product research
14.PMID: 41052623 (2025) — Effect of Origanum majorana tea on oxidative stress biomarkers in Parkinson's disease: a randomized placebo-controlled pilot study. · Neuroscience
15.PMID: 39537771 (2024) — Comparative volatiles profiling of two marjoram products via GC-MS analysis in relation to the antioxidant and antibacterial effects. · Scientific reports