Star Anise
Also known as: Illicium verum, Chinese star anise, star anise essential oil, SAEO, shikimic acid source
Effective Dosage
No established dose for human supplementation from provided studies
What the Science Says
Star anise is a spice from the Illicium verum plant, long used in Asian traditional medicine. One small human clinical trial found that a star anise mouthwash reduced gum inflammation, bleeding, and oral bacteria over 21 days. Its key compound, shikimic acid, showed liver-protective and antioxidant effects in animal studies, but these results have not been confirmed in humans.
What It Doesn't Do
No human evidence it protects your liver. No proof it boosts immunity in people — fish and animal studies don't translate directly. Not shown to fight viruses in humans. Won't replace antibiotics. No evidence it aids weight loss or digestion in people.
Evidence-Based Benefits
Star anise has been studied for its potential antimicrobial and antifungal properties, as well as its use in traditional medicine for digestive issues. Some clinical trials suggest it may help alleviate symptoms of digestive discomfort and improve gut health.
Moderate EvidenceEffective at: No established dose
Source: auto-research
Absorption & Bioavailability
Unknown — no human pharmacokinetic data provided in the studies. Animal and in vitro models only.
Red Flags to Watch For
- Nearly all promising research is in animals (fish, rats) or lab settings — not in humans
- Spice contamination study found star anise can carry heavy metals like lead and cadmium depending on sourcing and soil quality
- Only one small human RCT exists in the provided data, and it was limited to oral/mouthwash use
- Shikimic acid studies used intraperitoneal injection in rats — not comparable to oral supplement use in humans
- Star anise essential oil is toxic if confused with Japanese star anise (Illicium anisatum), a known adulterant
Products Containing Star Anise
See how Star Anise is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-06