Oil of Oregano

Carvacrol Synergistic Anticancer Combinations

Carvacrol Synergistic Anticancer Combinations

Comprehensive Summary of Validated Drug Combinations

Oregano oil typically contains 65% to over 90% carvacrol, with most quality products standardized to 70-85% or higher, as carvacrol is the main active compound responsible for its potency, though levels vary greatly by oregano species (Origanum vulgare vs. heracleoticum) and processing. Higher percentages, often from Greek or Turkish oregano, indicate greater strength.

Partner Drug Study Type Cancer Synergy Score Key Pathway
5-Fluorouracil In vitro Breast CI < 1 P-gp/MDR1
Thymol In vitro Leukemia 70% kill Apoptosis
Thymol (1:1) In vitro Breast SI 144-267 COX-2/5-LOX
Doxorubicin NP In vitro Breast/Cervix CI 0.2-0.4 DNA damage
Paclitaxel In vitro Breast 87% kill Bax/Bcl-2
Cetuximab In vitro Lung CI = 2.0 EGFR/Caspase-3
Chloroquine In silico/vitro Melanoma Synergistic Autophagy
Sorafenib In vivo HCC Enhanced HIF-1Ξ±/STAT3
Tamoxifen NE In vitro ER+ Breast 6× uptake ROS/MMP
Legend
In vitro Cell line studies
In vivo Animal models
In silico Computational
CI = Combination Index (Chou-Talalay)
SI = Selectivity Index
NP = Nanoparticle
NE = Nanoemulsion
Systematic Review • January 2026 • Sources: PubMed, PMC, MDPI, ScienceDirect, Frontiers

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