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Oregano
Caution🐾Oregano · (Origanum vulgare)
Mint family (Lamiaceae)
Description
Wild oregano grows on dry, lime-rich Mediterranean slopes and only fully develops its pungent, spicy aroma once the flowering herb, gathered in July and August, is dried. Carvacrol and thymol in the essential oil are responsible for its characteristic scent, complemented by rosmarinic acid, tannins and triterpene acids. As a spice it flavours Mediterranean dishes, while as tea or tincture it is traditionally credited with supporting digestion and respiratory infections; externally, the essential oil is used for inhalation during colds. Concentrated oregano oil strongly irritates skin and mucous membranes and must never be applied undiluted — a dilution of at least 1:10 in a fixed carrier oil is required. High internal doses can cause nausea, vomiting and gastric irritation. Because of its traditionally ascribed emmenagogue effect, therapeutic doses should be avoided during pregnancy.
Traditional folk-medicinal use as an aromatic infusion for dyspeptic complaints (bloating, flatulence, loss of appetite) and for catarrhal upper-respiratory complaints such as irritable cough and incipient bronchitis. The active principle is the carvacrol-rich essential oil with digestive, spasmolytic and secretolytic effects.
Preparation & dosage
Pour 150 ml boiling water over 1-2 g dried oregano herb, cover and infuse for 10 minutes, then strain. Drink a fresh cup two to three times daily between meals.
- Dry amount
- 1–2 g
- Doses per day
- 3×
- Max duration
- 4 weeks
Folk-medicinal ethanolic tincture of the flowering herb for dyspeptic complaints, cramp-like stomach pain and productive bronchial catarrh. Ethanol preserves the volatile carvacrol-/thymol-containing essential oil and rosmarinic acid better than an aqueous infusion.
Preparation & dosage
1:5 tincture in 70 % ethanol from dried oregano herb. Usual daily dose: 20-40 drops (1-2 ml) three times daily in a little water before meals. Avoid in pregnancy.
- Liquid amount
- 1–2 ml
- Doses per day
- 3×
- Max duration
- 4 weeks
Oregano essential oil (Oleum origani) is traditionally used for its antimicrobial properties due to its high carvacrol and thymol content — applied diluted as a rub for cold complaints or as an additive for inhalations. Strongly skin-irritating when undiluted; always dilute in a fixed carrier oil.
Preparation & dosage
Dilute 1-3 drops oregano essential oil in 10 ml almond or olive oil and rub onto chest/back. Not undiluted on the skin, not in the eyes, not for internal use without professional guidance.
- Liquid amount
- 0.05–0.15 ml
- Doses per day
- 2×
⚠ Age restriction: ≥ 4 years — Oregano essential oil must not be used in infants and children under 4 years due to carvacrol/thymol content — risk of mucous-membrane irritation and laryngospasm with facial application.
Folk-medicinal steam inhalation of oregano herb or a few drops of diluted oregano essential oil for stubborn bronchial mucus, rhinitis and incipient bronchitis. The secretolytic action of carvacrol and thymol loosens viscous mucus.
Preparation & dosage
Pour 1 L hot (not boiling) water over a handful (5-10 g) of dried oregano herb, cover head with a towel, close eyes and inhale steam for 5-10 minutes. Alternatively add 2-3 drops oregano oil to 500 ml hot water.
- Dry amount
- 5–10 g
- Doses per day
- 2×
⚠ Age restriction: ≥ 4 years — Inhalation with oregano oil not for children under 4 years due to carvacrol/thymol content — laryngospasm risk.
Classical Mediterranean culinary herb — the main use of oregano. Essential component of pizza, tomato, lamb and fish dishes, Greek and Italian salads. The essential oils stimulate appetite and digestion; moderate culinary amounts are safe, including in pregnancy.
Preparation & dosage
Folk-medicinal use as a warm compress for rheumatic complaints, muscle tension, bruises and slow-healing skin areas. The essential oils are hyperaemic and mildly antiseptic.
Preparation & dosage
Oregano essential oil is strongly skin- and mucous-membrane irritating in concentrated form — never apply undiluted; always dilute at least 1:10 in a fixed carrier oil. High doses can cause nausea, vomiting and gastric irritation. Avoid therapeutic doses during pregnancy (carvacrol and thymol effects, traditional use as emmenagogue). ASPCA classification (accessed 2026-08-10): toxic to dogs, cats and horses.
⏱ Max continuous use: 4 weeks
Culinary amounts are safe. Avoid therapeutic doses (tea, tincture, oregano oil) during pregnancy — carvacrol and thymol are considered uterotonic; oregano was traditionally (TCM, European folk medicine) used as an emmenagogue.
Culinary amounts are safe during breastfeeding. Use therapeutic doses sparingly due to insufficient data.
Oregano essential oil must not be used in infants and children under 4 years due to carvacrol/thymol content — risk of mucous-membrane irritation and laryngospasm with facial application. Tea in moderate amounts is safe from school age.
Drug interactions
Antikoagulanzien / Thrombozytenaggregationshemmer
Carvacrol and thymol inhibit platelet aggregation in vitro; concurrent use with warfarin, heparin, aspirin or clopidogrel may theoretically potentiate anticoagulant effects.
Antidiabetika
Oregano extracts may slightly lower blood sugar; potentially synergistic when taken with antidiabetic medication — monitor glucose values closely.
CYP3A4-Substrate
Carvacrol modulates CYP3A4 in vitro and may theoretically affect the metabolism of numerous drugs (statins, immunosuppressants, some antiarrhythmics). Clinical relevance unclear; use high-dose oregano oil preparations cautiously.
Eisenpräparate
Tannins in oregano can reduce absorption of oral iron. Maintain at least a 2-hour interval between iron supplements and larger amounts of oregano tea.
Contraindications
- Known hypersensitivity to oregano, other Lamiaceae (thyme, savory, sage) or carvacrol/thymol.
- Oregano essential oil: undiluted application to skin or facial application in infants and children under 4 years (laryngospasm risk).
- Pregnancy: avoid therapeutic doses (culinary amounts safe).
Harvested part: flowering herb
- Time of day:
- Late morning in dry, sunny weather during full flowering (July-August) — essential-oil content with carvacrol/thymol is then at its peak.
- Drying:
- Hang shoots in small bundles upside down in a warm, airy, shaded place (max 35 °C). Strip leaves and flowers from stems after drying.
- Storage:
- 12 months — Store in dark, tightly closed glass or tin containers, cool and dry. The essential oil evaporates quickly with light and air.
- Time of day:
- Harvest individual shoot tips continuously during the growing season (June-September), ideally before flowering starts for culinary use — leaves are then especially aromatic and mild.
- Drying:
- Spread leaves thinly on a cloth and dry in a shaded, airy place, or at max 35 °C in a dehydrator.
- Storage:
- 12 months — Store airtight in dark glass jars — aroma is preserved for about a year under dry, cool storage.
- Ätherisches Öl (Carvacrol, Thymol, p-Cymol, gamma-Terpinen, Linalool)Essential oilContent: 0.15-4 %Aerial parts
Leading marker substance and main active principle. Carvacrol (40-80 % of the oil) and thymol (traces up to 10 %) determine the antimicrobial, spasmolytic and secretolytic profile. Chemotypes vary strongly with origin and subspecies; Mediterranean wild forms are particularly carvacrol-rich.
- RosmarinsäurePhenolic acidContent: 0.5-2.5 %Aerial parts
Major phenolic acid of the Lamiaceae with pronounced antioxidant, anti-inflammatory and antiviral activity. Water-soluble, well extracted in tea.
- Flavonoide (Apigenin, Luteolin, Origanol)FlavonoidContent: 0.3-1 %Aerial parts
Flavones and flavone glycosides with antioxidant, mildly spasmolytic and vasoprotective properties. Origanol is a flavone characteristic of Origanum.
- Triterpensäuren (Ursolsäure, Oleanolsäure)OtherContent: 1-3 %Aerial parts
Pentacyclic triterpenes with anti-inflammatory and hepatoprotective effects; contribute to the action of external preparations.
- Gerbstoffe (Lamiaceen-Gerbstoffe)TanninContent: ca. 8 %Aerial parts
Astringent tannins of the Lamiaceae group; contribute to local effects on mucous membranes and skin and reduce iron absorption (interaction).
- BitterstoffeBitterContent: SpurenanteileAerial parts
Bitter accompanying substances contribute to the appetite- and bile-flow-stimulating effect (aromatic bitter).
- Phenolcarbonsäuren (Kaffeesäure, Chlorogensäure, Protocatechusäure)Phenolic acidContent: 0.2-0.8 %Aerial parts
Accompanying phenolic acids contribute to the total antioxidant capacity and to the stabilising effect in foods.
- [1]MonographPlants For A Future — Origanum vulgare(accessed: 2026-05-19)
- [2]MonographHeilkraeuter-Lexikon — Oregano / Wilder Majoran(accessed: 2026-05-19)
- [6]MonographUSDA FoodData Central — Spices, oregano, dried (FDC ID 171328)(accessed: 2026-05-19)
- [7]MonographASPCA Animal Poison Control — Oregano (Origanum vulgare hirtum): Toxic to Dogs, Toxic to Cats, Toxic to Horses(accessed: 2026-08-10)
- [3]BookMadaus, Gerhard: Lehrbuch der biologischen Heilmittel, Bd. III — Origanum vulgare (1938, PD)(accessed: 2026-05-19)
- [4]WikipediaWikipedia DE — Echter Dost (Origanum vulgare)(accessed: 2026-05-19)
- [5]WikipediaWikipedia EN — Oregano (Origanum vulgare)(accessed: 2026-05-19)
Distribution in Europe
🪴 Grow at home
- ☀ Light
- full sun
- 💧 Water
- weekly
- 🌱 Soil
- Standard herb compost, well-draining
- 🪴 Pot
- 18 cm
- ⭐ Difficulty
- ★☆☆ beginner
- 🐾 Pets
- toxic to pets
Tips:
- Sunny spot intensifies aroma.
- Leaves taste best before flowering.
- Prefers dry over wet.
Care tips are general indoor-gardening recommendations, not scientific sources.
🤝 Permaculture Partners
In your garden, this plant acts as:
✨ Best symbiotic partners
- 🌿 Yarrow Classic companion-planting partner.
- 🌿 Cucurbita pepo Classic companion-planting partner.
- 🌿 Lavandula angustifolia Classic companion-planting partner.
- 🌿 Matricaria chamomilla Classic companion-planting partner.
- 🌿 Basil Classic companion-planting partner.
- 🌿 Salvia officinalis Classic companion-planting partner.
- 🌿 Thymus vulgaris Both aromatic and bee-friendly — ideal neighbours.
📦 Part of these planting sets:
Source: Helga und Margarete Langerhorst, Mein gesunder Naturgarten (eigene Kuration)