Clove
Syzygium aromaticum
A potent aromatic spice and the richest dietary source of eugenol. Clove oil is a recognized topical analgesic for toothache, and the spice has strong antioxidant and antimicrobial properties.
What is Clove?
Cloves are the dried, unopened flower buds of Syzygium aromaticum, an evergreen tree native to the Maluku Islands of Indonesia. Among the most antioxidant-dense foods by weight, cloves have been traded for millennia and are used as a warming culinary spice and in traditional medicine, most famously as a dental analgesic. Clove essential oil is the most concentrated source of eugenol available.
Known Health Benefits
How It Works
Eugenol, which makes up 70–90% of clove essential oil, is a natural analgesic and anesthetic that blocks voltage-gated sodium channels and desensitizes pain receptors (including TRPV1), explaining its long-standing use for dental pain. Eugenol and beta-caryophyllene are potent antioxidants and anti-inflammatory agents, inhibiting COX enzymes and pro-inflammatory cytokines; beta-caryophyllene also activates CB2 cannabinoid receptors. Clove extracts disrupt microbial cell membranes, giving broad antibacterial and antifungal activity, and preliminary research suggests clove compounds improve insulin function and slow carbohydrate digestion.
What Research Says
Clove's analgesic action is the best-supported use: a 2006 randomized trial in the Journal of Dentistry found clove-based gel comparable to benzocaine for numbing prior to needle insertion. Clove has among the highest ORAC (antioxidant) values of any spice. Test-tube and animal studies consistently show antimicrobial effects against oral and food-borne pathogens. Early human and animal research suggests clove extract may improve fasting glucose and insulin sensitivity, but robust human trials for systemic effects are limited.
Active Compounds
Eugenol, eugenyl acetate, beta-caryophyllene, gallic acid
Forms & Bioavailability
Eugenol is lipophilic and rapidly absorbed both topically through mucous membranes and orally through the gut, where it is metabolized in the liver and excreted. Topical application provides fast, localized pain relief. Because the oil is so concentrated, it must always be diluted in a carrier oil before contact with tissue.
Dosage Guidance
| Use Case | Dosage |
|---|---|
| Toothache (topical) | 1–2 drops clove oil diluted in carrier oil |
| Culinary / antioxidant | Spice to taste |
| Oral rinse | Few drops in water |
Always consult a healthcare provider for personalized dosing.
Potential Side Effects
Culinary use is very safe. Clove oil is highly concentrated and can irritate or burn gums and mucous membranes; ingesting clove oil can be toxic, especially in children, causing liver damage and seizures.
Who Should Avoid It
- Children (clove oil ingestion can be toxic)
- Bleeding disorders or upcoming surgery (antiplatelet effect)
- Anticoagulant therapy without medical guidance
- Liver disease (high-dose eugenol is hepatotoxic)
Pregnancy & Lactation
Culinary amounts are safe. Concentrated clove oil and high-dose supplements should be avoided during pregnancy and breastfeeding due to insufficient safety data and eugenol toxicity at high doses.
Known Drug Interactions
Eugenol has antiplatelet effects and may increase bleeding risk with anticoagulants (warfarin, aspirin). May add to blood-sugar-lowering medications.
Evidence Classification
Supported by cohort studies, case-control studies, or multiple observational studies with consistent findings.
Frequently Asked Questions
Does clove oil really help toothache?
Yes. Eugenol, the main compound in clove oil, is a well-documented topical anesthetic that blocks pain signals and has mild antibacterial action. It can provide temporary relief but is not a substitute for dental treatment of the underlying problem.
Can I swallow clove oil?
No. Clove essential oil is extremely concentrated, and ingesting it — especially by children — can cause serious harm including liver damage and seizures. Use clove oil topically and diluted only; for internal benefits, use the culinary spice.
Is clove good for blood sugar?
Early laboratory and animal studies suggest clove compounds may improve insulin sensitivity and slow carbohydrate digestion, and some small human studies are encouraging. The evidence is not yet strong enough to recommend clove as a blood-sugar treatment.
References
- The effectiveness of clove and benzocaine gels as topical anesthetics. Alqareer A, Alyahya A, Andersson L. J Dent (2006)View study
- Biological activities and chemistry of eugenol: a review. Kamatou GP, Vermaak I, Viljoen AM. Molecules (2012)View study
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This entry is for educational purposes only. It is not medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement regimen, especially if you take medications or have health conditions.