Herbs

Oregano oil

Also called: oil of oregano, carvacrol

Concentrated oil from oregano.

Why people take it
Infections, gut.
What the evidence says
Lab studies only; no good human evidence.
How it is usually taken
Capsules of 100 to 200 mg; dilute essential oil before any use.
Be careful
Irritating; can cause stomach upset.
Medicines it can interact with
May add to blood thinners and lower sugar; may reduce iron absorption.

Other herbs

EchinaceaElderberryGarlic extractGingerPeppermint oilMilk thistleSaw palmettoSt John's wortValerianChamomileLemon balmPassionflowerKavaRhodiolaGinkgoMoringaFenugreekCinnamonBlack seedLicorice

Common questions

What is Oregano oil?

Concentrated oil from oregano.

Why do people take Oregano oil?

Infections, gut.

Does Oregano oil work?

Lab studies only; no good human evidence.

How much Oregano oil do people take?

Capsules of 100 to 200 mg; dilute essential oil before any use.

Is Oregano oil safe?

Irritating; can cause stomach upset.

Does Oregano oil interact with medicines?

May add to blood thinners and lower sugar; may reduce iron absorption.

Sources and further reading

Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. Supplements are not medicines: they are not tested and approved like drugs before they are sold, and they can interact with medicines. Talk to your doctor or pharmacist before you start one, especially if you are pregnant or breastfeeding, take regular medicines, or have kidney, liver or heart disease.