iOnco
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Fennel

Foeniculum vulgare

Anti-tumourmoderate evidence

Trans-anethole and fenchone from fennel inhibit cancer cell growth and have shown anti-tumour activity against breast, colon, and liver cancers. Fennel is also a potent digestive herb that reduces the nausea, bloating, and digestive distress that frequently accompany cancer treatment.

Medicinal Properties

Anti-tumourDigestiveAntioxidantAnti-inflammatoryPhytoestrogenic
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Cancer Types Studied

BreastColonLiver

Recommended Dosage

1–2 tsp fennel seeds daily as tea, or 300–600 mg standardised extract.

Preparations

Fennel Seed Tea

Crush 1–2 tsp fennel seeds and steep in hot water 10 min. Excellent after-meal tea during chemotherapy for nausea.

NIH / PubMed Research

Links open on PubMed (National Library of Medicine). Research is ongoing — results may not reflect clinical use.

Cautions & Interactions

  • Contains phytoestrogens — caution in ER+ breast cancer without oncologist consultation
  • Avoid in pregnancy in medicinal doses
  • May interact with antibiotics (ciprofloxacin)
  • Fennel essential oil is concentrated — use seeds, not oil, internally

Informational only. Not medical advice. Consult your healthcare provider before use.