Oreganoöl

Overview

Oregano oil (Origanum vulgare essential oil) is a botanical supplement standardized to carvacrol (typically 60–80%) and thymol as primary bioactive compounds. Human clinical evidence exists for carvacrol specifically: a meta-analysis of 10 RCTs (PMID 39992592, n=562) on the closely related Zataria multiflora (same primary bioactive) showed significant reductions in IL-6, CRP, IL-8, and MCP-1; separate RCTs demonstrated improved pulmonary function in asthmatic patients and chemical warfare victims (PMIDs 33773189, 30961947, 30075886); a Phase I trial confirmed safety at 1–2 mg/kg/day in healthy subjects (PMID 30486682). In vitro studies confirm antimicrobial activity against S. aureus, S. mutans, and C. albicans. Caveat: RCTs used isolated carvacrol, not oregano oil as a supplement — direct OEO product trials in healthy populations are lacking. Typical supplement doses: 150–200 mg per dose, 1–3 times daily with meals (no validated clinical protocol). Main adverse effect: GI upset, especially on empty stomach. Potential mild anticoagulant activity (carvacrol, thymol) — relevant before surgery or with blood thinners. Affirmed GRAS as food flavoring by FEMA (2021).

Dosage

200 mg · With meal · Take with food

Scientific Sources

• Human RCT in athletes (14 days): significant HDL-C increase with origanum essential oil
• Systematic review + meta-analysis of 10 RCTs (n=562): Zataria multiflora/carvacrol significantly reduces IL-2, IL-4, IL-6, IL-8, CRP, MCP-1; increases IFN-γ, IL-10
• Triple-blind RCT (n=92): Zataria multiflora extract for ulcerative colitis (2025)
• Randomized double-blind RCT (n=33): carvacrol 1.2mg/kg/day in asthma patients — significant improvement in respiratory symptoms and pulmonary function over 2 months
• Randomized placebo-controlled trial: carvacrol in sulfur mustard-exposed veterans — improved FEV1, reduced inflammatory mediators
• Phase I clinical trial in healthy subjects: carvacrol 1-2mg/kg/day for 1 month — safe and well tolerated
• Double-blind RCT: carvacrol in sulfur mustard victims — reduced cytokines, improved pulmonary function tests
• FEMA GRAS reassessment: Origanum oil affirmed as GRAS as food flavoring ingredient (2021)
• 2025 systematic review: carvacrol modulates gut inflammation via TNF-alpha/IL-1beta (preclinical)
• Review: carvacrol and thymol as primary antimicrobial and antioxidant compounds in OEO
• In vitro: antimicrobial against S. aureus, S. mutans, C. albicans — carvacrol most active

Frequently Asked Questions