Quick Summary

Anise (Pimpinella anisum) is a medicinal herb traditionally used in various cultures for gastrointestinal symptoms, lactation support, menstrual disorders, and respiratory ailments. Contemporary clinical research is emerging but remains limited. Evidence from randomized controlled trials exists for some uses, though overall certainty ranges from low to moderate. Safety data suggest mostly minor adverse effects, but comprehensive safety and interaction profiles are not well established.

What is It?

Anise is a flowering plant of the Apiaceae family, native to the eastern Mediterranean region and Southwest Asia. It is primarily known for its seeds, which have a distinctive licorice-like aroma and have been used as a spice and medicinal herb. The seeds contain several bioactive compounds believed to contribute to its traditional uses.

Traditional Uses

  • Treating gastrointestinal complaints such as bloating, indigestion, and diarrhea
  • Supporting lactation in nursing mothers
  • Relieving menstrual disorders, including menstrual pain (dysmenorrhea)
  • Addressing respiratory conditions and symptoms

Active Compounds

Anise seeds contain several bioactive compounds with potential pharmacological effects, including:

  • Trans-anethole (major component)
  • Anisaldehyde
  • Anisic acid
  • Esters and flavonoids

Potential Benefits with Evidence Levels

  • Breastmilk production in mothers of preterm infants: Low certainty evidence from randomized controlled trials suggests that anise seed tea may increase milk volume by day 7 compared to placebo.
  • Gastrointestinal symptoms in COVID-19 patients: A randomized controlled trial with a modest sample size found that aniseed powder (mainly trans-anethole) taken for 2 weeks improved abdominal pain, anorexia, and diarrhea versus placebo.
  • Primary dysmenorrhea (menstrual pain): A systematic review including RCTs with some concerns of bias indicates that herbaceous Apiaceae family plants, including anise, show potential as adjunct therapies, but further high-quality trials are needed.
  • Functional dyspepsia and gastrointestinal disorders: Limited and low certainty evidence from a systematic review suggests anise may improve symptoms, though study quality varies.
  • Complementary treatment for chronic rhinosinusitis: Limited evidence from a few controlled trials supports potential benefit, but further rigorous studies are required.

Side Effects

  • Mild gastrointestinal symptoms (e.g., mild to moderate adverse events reported in clinical trials)
  • Possibility of allergic reactions has not been well studied

Drug Interactions

No specific drug interactions with Pimpinella anisum have been reported in the clinical literature reviewed. However, due to limited pharmacokinetic data and lack of extensive interaction studies, potential interactions cannot be excluded.

Who Should Avoid It

There are no well-documented contraindications identified in available research. Caution is advised for individuals in populations where herbal safety data are incomplete, including pregnant and breastfeeding women, unless under professional guidance.

Evidence Limitations

  • Many clinical trials have small sample sizes and moderate to high risk of bias.
  • Heterogeneity in study designs, interventions, and outcomes limits comparability.
  • Lack of long-term safety data and pharmacokinetic studies.
  • Limited data on drug interactions and contraindications.
  • Most evidence is of low to moderate certainty and requires confirmation by larger, high-quality randomized controlled trials.

References

Last Reviewed

June 2024

Informational Disclaimer

This page provides educational information about Anise (Pimpinella anisum) based on available evidence as of the last review date. It is not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare provider before using herbal supplements, especially if you are pregnant, breastfeeding, have existing health conditions, or are taking medications.