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What is oregano tea good for? Coughs, digestion, the evidence and how to brew it

Origanum vulgare (including Greek oregano, O. vulgare subsp. hirtum) dried or fresh leaves and flowering tops

Oregano tea is good for a cough or chest cold, for sluggish digestion and bloating, and, by long Mediterranean tradition, for menstrual cramps. The leaves carry carvacrol and thymol (the antimicrobial essential oils), rosmarinic acid (an antioxidant, anti-inflammatory polyphenol) and a bitter, aromatic profile that gets digestive juices moving. What a cup can honestly promise is comfort and a plausible mechanism; what it cannot promise is a result from a human trial, because almost none have been done on the tea itself.

Most oregano research quoted online is either on oregano essential oil, taken in capsules at doses that bear no relation to a cup of tea, or on test-tube experiments with isolated carvacrol. Hot water extracts only a fraction of those oils and a good share of the water-soluble polyphenols. That makes the tea gentler and safer than the oil, and also weaker.

This page separates what has been shown in people from what has been shown in petri dishes, and gives a brewing method that gets the most out of the leaf.

What oregano tea is good for

  • Cough and chest colds — carvacrol and thymol are antimicrobial and expectorant in laboratory work; warm steam and liquid help regardless
  • Digestion and bloating — a bitter aromatic that stimulates gastric juice and relaxes gut muscle by tradition; no trial of the tea
  • Antioxidant and blood vessels — a 3-month trial of 25 ml a day of distilled oregano water improved artery function and lipids in 48 adults
  • Menstrual cramps — traditional warming antispasmodic; mechanistic support only
  • Blood sugar — oregano extracts block carbohydrate-digesting enzymes in the lab; no human data for tea
  • Not the same as oregano oil — the oil is dozens of times more concentrated and should never be added undiluted to tea

Oregano tea benefits, graded by the evidence

Strong = multiple human trials or a meta-analysis. Moderate = a few small trials. Preliminary = early, traditional or animal data.

  1. Supports blood vessel function and cholesterol

    Preliminary evidence

    The only controlled human study of a drinkable oregano preparation gave 48 patients with mildly raised cholesterol 25 ml a day of an aromatic water distilled from Origanum onites for 3 months alongside a diet, and compared them with diet alone (Ozdemir et al., 2008). The oregano group had better flow-mediated dilation (a measure of artery lining health), lower LDL and higher HDL cholesterol. It was a single small Turkish trial of a distillate rather than a tea, so it is encouraging rather than conclusive.

    Key evidenceOzdemir et al., Journal of International Medical Research 2008 — 48 hyperlipidaemic patients, 3 months

  2. Antimicrobial activity against respiratory and gut bugs (laboratory)

    Preliminary evidence

    Carvacrol and thymol inhibit Staphylococcus aureus including MRSA, Streptococcus, E. coli, Salmonella and Candida in culture at low concentrations (Nostro et al., 2004), and oregano is one of the most potent culinary herbs in antibacterial screens. The one human study often cited, 14 adults whose gut parasites cleared after 6 weeks of 600 mg a day of emulsified oregano oil (Force et al., 2000), used oil, not tea, at a dose no infusion approaches. A cup of tea is not an antibiotic.

    Key evidenceNostro et al., FEMS Microbiology Letters 2004 — carvacrol and thymol against methicillin-resistant staphylococci

  3. Cough, congestion and chest-cold comfort

    Preliminary evidence

    Oregano shares its key compounds with thyme, and a thyme-based syrup reduced coughing fits by about 68% versus placebo over 11 days in a randomised trial of 361 adults with acute bronchitis (Kemmerich et al., 2006). That is the closest trial evidence, and it is for a different plant in a different form. For oregano tea specifically there is tradition, a plausible expectorant action of the volatile oils, and the simple benefit of warm fluid and steam on a tight chest.

  4. Eases bloating, gas and sluggish digestion

    Preliminary evidence

    Carvacrol relaxes isolated gut smooth muscle in laboratory preparations, and oregano's bitterness triggers the reflex release of saliva, stomach acid and bile that bitter herbs are traditionally used for. In mice, oregano extract reduced inflammation in a model of colitis. None of this has been measured in people drinking the tea, but the mechanism is the same one that makes peppermint and fennel useful, and the practical experience of a cup after a heavy meal is consistent with it.

  5. Antioxidant and anti-inflammatory polyphenols

    Preliminary evidence

    Dried oregano scores among the highest of all culinary herbs for phenolic content and radical-scavenging activity (Zheng and Wang, 2001), mainly from rosmarinic acid, which also dampens inflammatory signalling in cell and animal models. A cup brewed from 2 g of leaf supplies tens of milligrams of rosmarinic acid and related phenolics. Whether that changes any inflammatory marker in a person who drinks it regularly has not been tested.

    Key evidenceZheng and Wang, Journal of Agricultural and Food Chemistry 2001 — antioxidant activity and phenolic compounds in selected herbs

  6. Menstrual cramps

    Preliminary evidence

    Oregano tea is a traditional remedy for period pain across Greece, Turkey and the Middle East, and carvacrol's antispasmodic effect on smooth muscle gives it a plausible basis. No clinical trial has tested it for dysmenorrhoea. If you want a herbal tea with actual trial data for cramps, ginger and chamomile are better supported; oregano is a reasonable warm, aromatic addition rather than a proven treatment.

Is oregano tea good for you?

  • Yes: as a pleasant, caffeine-free, polyphenol-rich tea it is good for most adults, and useful comfort for a cough or an over-full stomach.
  • Its benefits rest mainly on laboratory work and tradition. A cup is not a treatment for an infection, and it will not do what oregano oil capsules did in the few small trials that exist.
  • Limit or avoid it in pregnancy (it is traditionally used to bring on periods), if you are allergic to mint-family plants, or if you take blood thinners, lithium or diabetes medication.
  • One to two cups a day is sensible; it is a strong-flavoured, bitter herb and large amounts can upset the stomach.

How to brew oregano tea

Amount

1 teaspoon (1–2 g) dried oregano or 1 tablespoon fresh leaves per 8 oz (240 ml)

Water

200°F / 93°C, just off the boil

Steep

5 to 10 minutes, covered, then strain

  • Keep the cup covered while it steeps; carvacrol and thymol are volatile and escape with the steam.
  • Greek oregano (Origanum vulgare subsp. hirtum) is richest in carvacrol. Mexican 'oregano' (Lippia graveolens) is a different plant with a similar flavour.
  • Honey and lemon suit a cough cup; a pinch of fennel seed or a few mint leaves suit a digestive one.

How much per day

One to two cups a day. Oregano tea has no established upper limit, but it is strongly flavoured and bitter, and more than three cups can cause stomach upset; for a cough or cold, two to three cups a day for a few days is reasonable.

Caffeine-free. The lift some people feel is the aromatic oils, not a stimulant.

Side effects, interactions and who should limit it

Side effects

  • Stomach upset or nausea from strong or frequent cups
  • Allergic reaction in people sensitive to basil, mint, sage, lavender or marjoram (the Lamiaceae family)
  • Possible mild drop in blood sugar
  • Mouth or throat irritation if essential oil is added; never put oregano oil undiluted into tea
  • Reduced iron absorption if drunk with iron-rich meals, as with other polyphenol-rich teas

Interactions

  • Anticoagulants and antiplatelets (warfarin, clopidogrel, aspirin): oregano may slightly slow clotting; monitor
  • Diabetes medicines: possible additive blood sugar lowering
  • Lithium: oregano's mild diuretic effect could raise lithium levels
  • Iron supplements: take at least an hour apart
  • Drugs metabolised by CYP3A4 or CYP2C9: theoretical, from essential oil studies; unlikely to matter at tea doses

Pregnancy and breastfeeding

Culinary amounts are fine, but regular medicinal cups are best avoided in pregnancy because oregano has a traditional use as an emmenagogue (a herb that brings on menstruation) and there are no safety studies. The same gap applies to breastfeeding; an occasional cup is unlikely to matter, daily use has not been tested.

Frequently asked questions

Is oregano tea good for a cough?

It is a sensible thing to drink with one. The volatile oils are expectorant and antimicrobial in laboratory tests, the warm liquid and steam loosen mucus, and honey added once it has cooled a little has its own trial evidence for cough. The closest trial data come from thyme, a near relative, so treat oregano as comfort with a plausible mechanism rather than a proven remedy.

Is oregano tea a natural antibiotic?

No. Carvacrol kills bacteria in a petri dish, and concentrated oregano oil has some small human studies, but a cup of tea contains a tiny fraction of those concentrations and nothing like an antibiotic dose. If you have a bacterial infection that needs treating, oregano tea will not do it.

Does oregano tea help with bloating or gas?

Many people find it does, and the mechanism is reasonable: it is bitter, which stimulates digestive secretions, and its oils relax gut muscle in laboratory work. There is no clinical trial, so it is tradition plus pharmacology. Peppermint and fennel have better evidence if bloating is a regular problem.

Can I make oregano tea from the dried oregano in my spice rack?

Yes, as long as it is plain oregano and not a seasoning blend with salt. Fresher is better: dried oregano older than a year has lost much of its aroma and most of its volatile oils. A heaped teaspoon per cup, covered, for 5 to 10 minutes is the method.

Does oregano tea help with period cramps?

It is a long-standing folk remedy and carvacrol relaxes smooth muscle, but no trial has tested it for period pain. Ginger has randomised trial evidence for cramps, so ginger with a little oregano is a reasonable combination if you like the flavour. Stop using it if you might be pregnant.

Is oregano tea safe to drink every day?

For most adults, a cup or two a day is fine. The main cautions are pregnancy, allergy to mint-family plants, and interactions with blood thinners, lithium and diabetes medication. Large daily amounts can cause stomach upset and reduce iron absorption.

What is the difference between oregano tea and oil of oregano?

Oil of oregano is a steam-distilled essential oil that is 60 to 80 percent carvacrol and is sold in capsules or drops; it is potent, irritating and has real interaction and safety concerns. Tea is a hot-water infusion of the leaf containing mostly water-soluble polyphenols and only a trace of the oil. They are not interchangeable, and you should never add the oil to tea.

References

  1. Ozdemir B, Ekbul A, Topal NB, et al.. Effects of Origanum onites on endothelial function and serum biochemical markers in hyperlipidaemic patients. Journal of International Medical Research (2008)
  2. Force M, Sparks WS, Ronzio RA. Inhibition of enteric parasites by emulsified oil of oregano in vivo. Phytotherapy Research (2000)
  3. Nostro A, Blanco AR, Cannatelli MA, et al.. Susceptibility of methicillin-resistant staphylococci to oregano essential oil, carvacrol and thymol. FEMS Microbiology Letters (2004)
  4. Kemmerich B, Eberhardt R, Stammer H. Efficacy and tolerability of a fluid extract combination of thyme herb and ivy leaves and matched placebo in adults suffering from acute bronchitis with productive cough. Arzneimittelforschung (2006)
  5. Zheng W, Wang SY. Antioxidant activity and phenolic compounds in selected herbs. Journal of Agricultural and Food Chemistry (2001)
  6. Leyva-López N, Gutiérrez-Grijalva EP, Vazquez-Olivo G, Heredia JB. Essential oils of oregano: biological activity beyond their antimicrobial properties. Molecules (2017)
  7. Sharifi-Rad M, Varoni EM, Iriti M, et al.. Carvacrol and human health: a comprehensive review. Phytotherapy Research (2018)
  8. Gutiérrez-Grijalva EP, Picos-Salas MA, Leyva-López N, et al.. Flavonoids and phenolic acids from oregano: occurrence, biological activity and health benefits. Plants (Basel) (2018)
  9. Petersen M, Simmonds MS. Rosmarinic acid. Phytochemistry (2003)

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This page is educational and is not medical advice. Herbal teas can interact with prescription medicines. Talk with a clinician or pharmacist before relying on any of them, especially if you are pregnant, breastfeeding, have a chronic condition, or take medication.