Eugenol

Eugenol's principal actions include modulation of TRPV1 ion channels (contributing to its local analgesic effect at high local concentrations), inhibition of cyclooxygenase enzymes (anti-inflammatory effect), and broad antimicrobial activity against bacteria, fungi, and protozoa. After oral or topical absorption it is metabolized in the liver through conjugation reactions. Dental applications rely on its combined analgesic and antiseptic effects in eugenol-zinc oxide pastes. As a dietary constituent from spices, eugenol contributes flavor and small antioxidant exposure. Some preclinical research suggests anticancer, neuroprotective, and metabolic effects at high doses, but human clinical evidence at supplement levels is limited.

There is no RDA. Dietary intake from spices is small (typically under 100 mg/day). The WHO acceptable daily intake is 2.5 mg/kg body weight. Concentrated eugenol or clove oil supplementation is generally not advised due to toxicity concerns.

Spice-level intake follows normal meal patterns. For topical dental analgesia, apply directly to affected tooth or gum. Avoid prolonged topical use due to irritation. Oral concentrated supplementation is not recommended without professional guidance.

Eugenol is GRAS for food use at spice levels. Concentrated clove oil can be toxic, with serious adverse events (liver injury, seizures, metabolic acidosis) reported in pediatric ingestion. Topical eugenol may cause contact dermatitis. Mucous membrane irritation is possible with pure eugenol. No formal Tolerable Upper Intake Level has been established.

Eugenol may inhibit platelet aggregation and theoretically increase bleeding risk with anticoagulants. May potentiate CNS depressants. Some CYP enzyme interactions possible at high doses.