Safety Profile
Overall safety rating: Safe with Caution
Oregano Oil Side Effects & Safety
This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer
Potential Side Effects
- GI irritation, heartburn, and nausea — especially with undiluted or high-dose use
- Burning sensation in mouth and throat with sublingual administration
- May reduce beneficial gut bacteria if used for extended periods
- Allergic reactions in individuals allergic to Lamiaceae family plants (mint, basil, sage)
- Skin irritation if applied topically without dilution
Drug & Supplement Interactions
- Blood thinners — carvacrol may have anticoagulant properties; avoid combining or consult physician
- Iron supplements — oregano oil may reduce iron absorption; separate by 2+ hours
- Diabetes medications — may lower blood sugar; monitor glucose levels
- Antibiotics — potential synergistic antimicrobial effects but also risk of gut flora disruption; discuss with prescriber
Maximum Dose
Do not exceed: Use for short courses (7-14 days) at recommended doses; not for continuous long-term use
References
- Force M, Sparks WS, Ronzio RA (2000). Inhibition of enteric parasites by emulsified oil of oregano in vivo. Phytotherapy Research. DOI PubMed
- Lu M, Dai T, Murray CK, Wu MX (2018). Bactericidal property of oregano oil against multidrug-resistant clinical isolates. Frontiers in Microbiology. DOI PubMed