Named Bioactive Compounds · Compound
Anethole (Phenylpropene)
Moderate Evidencephenolic_compound2 PubMed Studies
Hermetica Superfood Encyclopedia
Anethole is a phenolic compound found in fennel and star anise that demonstrates anticancer properties through apoptosis induction and cell cycle arrest. Clinical research shows anethole derivatives can reduce lung cancer progression by 46% in high-risk smokers.
Anethole is a bioactive phenylpropene compound found in the essential oils of anise and fennel plants, commonly used as a food preservative and flavoring agent. The compound exists primarily in the trans-anethole form (4-methoxypropenylbenzene) and is extracted from plant essential oils through standard distillation or solvent extraction methods.
Human clinical evidence remains limited to one randomized controlled trial of anethole dithiolethione (ADT) in 112 smokers, which demonstrated significant reduction in bronchial dysplasia progression over 6 months. The majority of research consists of preclinical in vitro and animal studies investigating anti-cancer, neuroprotective, and anti-inflammatory mechanisms. Comprehensive human clinical trials are lacking for most proposed therapeutic applications.
Human clinical trial: Anethole dithiolethione (ADT) 25 mg orally three times daily (75 mg total) for 6 months. Animal studies used: 10-100 mg/kg for antidepressant effects in mice; 125-500 mg/kg for cognitive enhancement in rats. No standardized dosing established for pure anethole in humans. Consult a healthcare provider before starting any new supplement.
Anethole is a pure phenylpropanoid aromatic compound (trans-anethole being the predominant naturally occurring isomer, >95% in most extracts), not a whole food and therefore contains no macronutrients, fiber, vitamins, or minerals in its isolated form. Molecular formula: C10H12O; molecular weight: 148.20 g/mol. It is the primary bioactive constituent of anise (Pimpinella anisum, ~1.5–3% essential oil content, of which anethole comprises 80–95%), star anise (Illicium verum, ~5–8% essential oil, 80–90% anethole), and fennel (Foeniculum vulgare, ~2–6% essential oil, 50–80% anethole). As a phenylpropene, it is structurally related to estragole and eugenol. Bioactive concentration in commercial star anise essential oil: approximately 800–900 mg/g of oil. trans-Anethole has an estimated oral bioavailability that is moderate; it undergoes hepatic oxidative metabolism via CYP450 enzymes (primarily CYP1A2 and CYP2A6) to form para-anisaldehyde, anise ketone (1-phenyl-2-propanone derivative), and epoxide intermediates. The cis-isomer is considered more toxic and is present only in trace amounts (<0.1%) in food-grade sources. Log P (octanol-water partition coefficient): ~3.0, indicating moderate lipophilicity, which facilitates membrane permeability and oral absorption. No caloric or micronutrient value is assigned as it functions strictly as a bioactive phytochemical. ADI (acceptable daily intake) has not been formally established by EFSA or FDA for isolated anethole, though it is classified as GRAS (Generally Recognized As Safe) at food-use levels.
Anethole induces cancer cell apoptosis through mitochondrial membrane depolarization and activation of caspase-3 and caspase-9 pathways. It arrests cell cycle progression at G0/G1 phase by downregulating cyclin D1 and CDK4 expression. The compound also modulates NF-κB and p53 signaling cascades to promote tumor suppressor activity.
One randomized controlled trial evaluated ADT (anethole dithiolethione) in 60 smokers with bronchial dysplasia, showing 46% reduction in disease progression compared to placebo over 6 months. The study represents moderate-quality evidence for lung cancer chemoprevention in high-risk populations. Most other evidence comes from preclinical studies demonstrating anticancer effects across multiple cell lines including breast, colon, and prostate cancer models. Human clinical data remains limited to this single lung cancer prevention trial.
Anethole is generally recognized as safe when consumed in typical food amounts found in fennel and anise. High doses may cause allergic reactions in sensitive individuals, particularly those with existing plant allergies. The compound may interact with estrogen-sensitive medications due to mild estrogenic activity. Pregnant women should avoid therapeutic doses as anethole can stimulate uterine contractions, though culinary amounts appear safe.
