Carvacrol (Monoterpenoid Phenol · Broad-Spectrum Antimicrobial · Anti-biofilm)
| Compound | Carvacrol |
| Chemical class | Terpenoid — Monoterpenoid Phenol |
| CAS | 499-75-2 |
| Primary source | Origanum vulgare (oregano), Thymus vulgaris (thyme) |
| Key applications | Broad-spectrum antimicrobial, anti-biofilm, antifungal, anti-inflammatory |
| Claim strength | Moderate |
| Typical form | Carvacrol 90% isolate; oil of oregano (55–80% carvacrol) |
| Buy from Herbuno | Carvacrol 90% Powder (Oregano Extract) | Standardized Origanum Vulgare → |
Name origin: From Carvi (caraway) + -ol — early botanical source confusion; primary commercial sources are oregano and thyme. Traditional use: Oregano has extensive Mediterranean traditional use as an antimicrobial, digestive, and respiratory herb. Oil of oregano (high-carvacrol) has been used in folk medicine for infections and parasites across Southern European and Middle Eastern traditions. Research trajectory: Carvacrol has one of the most extensive natural antimicrobial evidence bases of any monoterpenoid, covering bacteria, fungi, biofilms, and viruses. Anti-inflammatory mechanisms (NF-κB inhibition, TRPV3 modulation) are well-characterised. Primary active in oil of oregano products marketed for immune and antimicrobial support. Commercial source: Carvacrol 90% isolate and Oregano Liquid Extract from Herbuno. See sourcing options below.
Evidence for Carvacrol Applications
Broad-spectrum antibacterial: MIC values of 0.05–0.5 mg/mL against S. aureus (including MRSA), E. coli, Salmonella, Campylobacter, P. aeruginosa, and H. pylori. Mechanism: disrupts bacterial cell membrane integrity by integrating into the lipid bilayer, increasing permeability. Multi-target bactericidal activity reduces resistance development. Claim strength: Moderate.
Anti-biofilm: Inhibits and disrupts preformed biofilms of S. aureus, E. coli, and C. albicans at sub-MIC concentrations. Relevant for oral care, wound care, and surface disinfection formulations. Claim strength: Moderate.
Antifungal: Active against Candida albicans, Aspergillus species, and dermatophytes via ergosterol synthesis inhibition and membrane disruption. Synergy with fluconazole documented in vitro. Claim strength: Moderate.
Anti-inflammatory: Inhibits NF-κB at low micromolar concentrations, modulates TRPV3, reduces prostaglandin synthesis. Animal models of colitis, arthritis, and lung inflammation confirm in vivo efficacy. Claim strength: Moderate.
Carvacrol 90% Powder (Oregano Extract) | Standardized Origanum Vulgare →
Browse Standardised Extract Powders →
Dosage & Formulator Specification
Oil of oregano supplement dose: 200–500 mg/day standardised oil (55–80% carvacrol, delivering 110–400 mg carvacrol/day). Isolated carvacrol 90%: 50–200 mg/day in formulation. Food preservation: 0.05–0.2% carvacrol in food matrices. Carvacrol is liquid at room temperature (mp 1°C) — encapsulate in soft gelatin or HPMC in an oil base. Strong phenolic aroma requires encapsulation or enteric coating for palatability. Must be diluted before oral or topical use — undiluted causes mucosal irritation via TRPV3 activation. Synergistic use with thymol at 1:1 ratio enhances antimicrobial spectrum.
Frequently Asked Questions — Carvacrol
Is oil of oregano the same as oregano extract?
Oil of oregano is a volatile essential oil high in carvacrol (55–80%) for antimicrobial applications. Oregano extract is a leaf extract standardised to rosmarinic acid for antioxidant/anti-inflammatory applications. Completely different bioactive profiles — do not substitute one for the other in formulation.
Can carvacrol replace antibiotics?
Carvacrol has genuine broad-spectrum in vitro antimicrobial activity. However, plasma concentrations achievable through oral oil of oregano supplementation are generally below in vitro MIC values for most pathogens. Appropriately positioned for gut antimicrobial support and immune supplementation; not a clinical antibiotic substitute.
Why must oil of oregano be diluted?
Undiluted carvacrol is strongly irritating to mucosal tissue and skin via TRPV3 activation and direct membrane disruption. Oral use: minimum 1:1 dilution in carrier oil. Topical: 1–3% in carrier oil. Undiluted topical application causes burns and sensitisation.
Does carvacrol affect the gut microbiome?
Carvacrol antimicrobial activity is non-selective — it can reduce both pathogenic and commensal bacteria. Short-course use (1–2 weeks) for acute immune support is common. Long-term daily use at high doses warrants probiotic co-supplementation to maintain microbiome diversity.
Related compounds: Thymol, Eucalyptol, Terpinen-4-ol, Limonene
Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.
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