Quick Summary

Star Anise (Illicium verum) is a plant primarily recognized for its essential oil, which is rich in trans-anethole and flavonoids. It has been studied for a range of biological properties including antimicrobial, anti-inflammatory, antioxidant, immunomodulatory, and molluscicidal effects. Most research to date is preclinical, with a few clinical studies focusing on related species, such as Pimpinella anisum. Evidence supporting the efficacy and safety of Star Anise in humans remains limited and requires further scientific validation.

What Is It?

Star Anise is the dried fruit of the Illicium verum tree, native to parts of Asia. It is commonly used as a spice and for its aromatic properties. The plant’s essential oil contains several bioactive compounds, which have attracted research interest for potential health-related applications.

Traditional Uses

Traditionally, Star Anise has been used in culinary applications as well as in herbal medicine. It has a history of use for digestive complaints, respiratory conditions, and infections in various traditional medicine systems. However, specific traditional medicinal uses vary by culture and are primarily based on empirical experience.

Active Compounds

  • Trans-anethole: The primary compound responsible for the characteristic flavor and aroma.
  • Flavonoids: Plant metabolites with potential antioxidant properties.
  • Other essential oil constituents contributing to bioactivity.

Potential Benefits with Evidence Levels

  • Antimicrobial and Antifungal Properties (Preclinical): Essential oils from Star Anise have demonstrated activity against dermatophytes and various bacteria in vitro. However, clinical evidence supporting these effects is lacking.
    Supporting studies: Chattha GM et al. 2026; Rath S, Padhy RN 2014.
  • Anti-inflammatory and Immunomodulatory Effects (Preclinical): Studies mainly in animal and computational models suggest Star Anise compounds may modulate oxidative stress and immune responses.
    Supporting studies: Mashaal A et al. 2025; Lubov JE et al. 2022; Sharifi-Rad J et al. 2017.
  • Antiviral Properties (Preclinical and Limited Clinical for Related Compounds): While direct clinical trials on Star Anise are lacking, related species (Pimpinella anisum) have shown some clinical benefits for gastrointestinal symptoms related to COVID-19.
    Supporting studies: Mosaffa-Jahromi M et al. 2024; Loo YS et al. 2025; Bahramsoltani R, Rahimi R 2020.
  • Potential Anticancer Activity (Preclinical): Evidence is indirect or based on bioactive components; no human clinical trials have confirmed anticancer effects.
    Supporting studies: Yang Y et al. 2025; Andleeb A et al. 2021.

Side Effects

  • Mild to moderate adverse effects have been reported in clinical trials involving aniseed powder (from Pimpinella anisum), but not specifically Star Anise.
    Source: Mosaffa-Jahromi M et al. 2024.
  • Potential presence of hepatotoxic constituents in herbal products has been noted, though no direct evidence implicates Star Anise itself. Caution is advised due to possible adulteration with toxic related species such as Illicium anisatum.
    Source: Quan NV et al. 2020.

Drug Interactions

No specific information is available regarding interactions between Star Anise and pharmaceutical drugs based on current research.

Who Should Avoid It?

Given limited safety data, individuals who are pregnant, breastfeeding, or sensitive to herbal products should exercise caution. Use should be avoided if there is a risk of contamination or adulteration with toxic related species. Consultation with a healthcare provider is recommended before use, especially for those with existing health conditions or on medication.

Evidence Limitations

The majority of available evidence for Star Anise is derived from in vitro studies, animal experiments, and computational models. Clinical trials specifically investigating Star Anise are scarce, and those available often involve related species. Variability in extract preparation, dosage, and formulation limits comparability and interpretation. Safety data remain preliminary, underscoring the need for rigorous human clinical studies to better establish efficacy and safety profiles.

References

Last Reviewed

April 2024

Disclaimer: This page is for informational purposes only and does not constitute medical advice. The use of Star Anise should not replace consultation with qualified healthcare professionals. Safety and efficacy have not been fully established, and individual responses may vary.