Botanical
Oregano Oil
Also known as: Oil of oregano, Oregano essential oil, Carvacrol
Potent antimicrobial herb with carvacrol and thymol compounds effective against bacteria, fungi, and some viruses.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Oregano Oil product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Pure Encapsulations MicroDefense w/ Oregano | 79 B+ | $0.41 |
| 2 | Bluebonnet Nutrition OIL OF OREGANO LEAF EXTRACT | 78 B+ | $0.29 |
| 3 | Natural Factors Oil of Oregano 180 mg Softgels | 71 B | $0.46 |
| 4 | Nature's Way Oregano Oil | 70 B | $0.40 |
| 5 | Natural Factors Oil of Oregano Liquid | 66 B- | $0.08 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Oregano Oil should I take?
The typical range is 100-200mg standardized to 60-80% carvacrol, 1-3x daily. Short-term use (2-6 weeks)
When should I take Oregano Oil?
With food. Yes, reduces GI burn.
Which form of Oregano Oil is best?
Enteric-coated capsules — Protects stomach, releases in intestines. Other forms in the catalog: Liquid drops, Softgels.
Is Oregano Oil safe?
Commonly reported: GI burning/upset, Heartburn, Nausea. Serious warnings: Can damage gut microbiome with prolonged use, Skin irritation if applied undiluted. Monitor with prolonged use
Which Oregano Oil supplement scores highest?
Pure Encapsulations MicroDefense w/ Oregano, at 79/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Primary uses
- Antimicrobial
- Antifungal
- Respiratory support
- Immune support
How it works
- Carvacrol disrupts microbial membranes
- Thymol adds antimicrobial action
- Antioxidant effects
- May have antiviral activity
Dosage
- Typical range
- 100-200mg standardized to 60-80% carvacrol, 1-3x daily
- Timing
- With food
- With food
- Yes, reduces GI burn
- Duration
- Short-term use (2-6 weeks)
- Special populations
- Those with suspected microbial issues
Forms
- Enteric-coated capsules
- Liquid drops
- Softgels
Safety
Common side effects
- GI burning/upset
- Heartburn
- Nausea
Contraindications
- Pregnancy
- Allergy to Lamiaceae family
- GERD
Products containing Oregano Oil
Top-scoring supplements in our catalog that list Oregano Oil on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
In vitro evidence strong, clinical limited
Grade B: Some human trials support key claims; further confirmation needed.
Related in Botanical
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.