Supplement analysis backed by scientific evidence · PT

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Limited evidenceGeneral health

Clove Oil

Clove oil is a legitimate topical dental analgesic thanks to its eugenol content, and that is where its evidence begins and ends. Swallowing it is a genuine hazard: as little as 5-10 mL has caused liver failure in a toddler.

What the science says

  • Relieves toothache when applied topically Moderate evidence

    Eugenol, which makes up 70-90% of clove oil, blocks voltage-gated sodium channels and TRPV1, producing local anesthesia and a counter-irritant effect. Systematic reviews of phytotherapeutic dental analgesics find clove/eugenol preparations produce pain relief broadly comparable to 20% benzocaine gel in small trials, and eugenol has been used in dentistry (zinc-oxide eugenol cements, dry socket dressings) for over a century. This is a short-term symptomatic measure, not treatment of the underlying pulpitis or abscess.

  • Antibacterial and antifungal action Limited evidence

    Clove oil and eugenol inhibit a wide range of oral and food-borne bacteria and Candida species in vitro at roughly 0.05-0.5% concentrations. That supports its role as a food preservative and mouth rinse ingredient; it has not been shown to treat any established human infection, and eugenol is cytotoxic to human fibroblasts at similar concentrations.

  • Oral clove capsules for digestion, blood sugar, or 'parasites' Limited evidence

    There are no adequately controlled human trials of ingested clove oil or clove extract for dyspepsia, glycemic control, or intestinal parasites. The parasite-cleanse marketing derives from a discredited 1990s protocol, not from clinical data. Given the documented hepatotoxicity of ingested eugenol, this is the one category where the absence of evidence sits alongside a real hazard.

  • Delays premature ejaculation (topical formulas) Limited evidence

    Clove appears in some multi-herb topical creams tested for premature ejaculation, where the presumed mechanism is simple local anesthesia. No trial has isolated clove oil, and the effect, if present, is indistinguishable from any topical anesthetic.

Dosage & safety

Studied doseDental use: 1-2 drops of clove oil (or a 5-20% eugenol preparation) on a cotton pledget applied to the affected tooth, not the gum, for a few minutes — repeated no more than a few times a day and for no more than 1-2 days while arranging dental care. Oral ingestion: no established safe supplemental dose; the JECFA acceptable daily intake for eugenol is on the order of 2.5 mg/kg/day, which a single drop of undiluted oil can approach. For aromatherapy or skin use, dilute to 0.5-1% in a carrier oil.
SafetyThis is the entry's most important section. Ingestion of concentrated clove oil is dangerous: a documented case of a 2-year-old who swallowed 5-10 mL developed fulminant hepatic failure with coagulopathy and coma, and multiple similar pediatric poisonings are on record — clove oil should be stored like a medicine, out of children's reach. Undiluted application burns oral mucosa and can cause gingival necrosis and pulp damage; 'clove oil burns' are a recognized dental complication. Eugenol causes allergic contact dermatitis and is a restricted fragrance allergen. It has antiplatelet activity, so avoid before surgery and use caution with warfarin or other anticoagulants. Avoid in children, in pregnancy at medicinal doses, and in anyone with liver disease or bleeding disorders. Culinary clove in food is not a concern.

Scientific references

Where to buy

NOW Foods, Essential Oils, Clove, 1 fl oz (30 ml)

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