Star Anise (Illicium verum)

Star anise is the dried, unripe fruit of Illicium verum, a small evergreen tree grown almost entirely in southern China and northern Vietnam. It is the eight-pointed star that gives phở its unmistakable sweet-licorice depth, one of the five spices in Chinese five-spice powder, and the backbone of red-braised pork.

This page carries two safety warnings, and they come before everything else because both cause real harm every year. First: a closely related tree, Japanese star anise (Illicium anisatum), is toxic, looks very similar, and has repeatedly been found contaminating and adulterating commercial star anise — causing seizures in adults and documented neurological illness in infants given star anise tea for colic. Star anise tea should never be given to an infant. Second: star anise is the industrial starting material for the antiviral drug oseltamivir (Tamiflu), and an enormous number of people have concluded from this that the spice treats influenza. It does not, and the section below explains exactly why the reasoning fails.

On the rest of the evidence: star anise is a superb culinary spice with a long record in Chinese and Vietnamese medicine and, for its medicinal claims, almost no human trial data. Nearly everything published on its pharmacology is laboratory or animal work. That is labelled clearly throughout.

Table of Contents

  1. Safety First: Japanese Star Anise and Anisatin
  2. Safety Second: Star Anise Does Not Treat Influenza
  3. Overview
  4. Names and Identification
  5. Where It Grows
  6. Traditional Use
  7. Active Compounds
  8. Digestive and Carminative Effects
  9. Antimicrobial Activity in the Laboratory
  10. Antioxidant and Anti-Inflammatory Research
  11. Culinary Use
  12. Forms and Preparations
  13. Dosage
  14. Cautions and Contraindications
  15. Key Research Papers
  16. Connections

Safety First: Japanese Star Anise and Anisatin

This is the most important thing on the page.

Two trees, one shape

Chinese star anise (Illicium verum) is the food spice. Japanese star anise (Illicium anisatum, known in Japan as shikimi) is not food. It is toxic, it is traditionally used in Japan as a ritual and funerary plant — grown at temples and graves, burned as incense — and it has never been a culinary spice anywhere. The two trees are close relatives and their dried fruits look broadly alike, which is the entire problem.

Anisatin

Illicium anisatum contains anisatin, a sesquiterpene dilactone that is a potent non-competitive antagonist at the GABA-A receptor. GABA is the brain's principal inhibitory neurotransmitter — the brake pedal. Anisatin works much like picrotoxin: it jams that brake. The result is uncontrolled neuronal excitation, and the clinical consequence is seizures, along with vomiting, tremor, agitation and, in infants, jitteriness, abnormal eye movements and abnormal muscle tone. It is potent enough that rodent models of anisatin-induced convulsive seizures are used as a standard experimental tool for studying seizure biochemistry.

What has actually happened to people

The regulatory response

The US Food and Drug Administration issued a consumer advisory in 2003 warning against consumption of star anise teas, with particular emphasis on infants, after the cluster of paediatric cases. European authorities imposed tightened import controls and testing requirements on star anise consignments following the Dutch outbreak. Neither action banned the culinary spice, and neither needed to — the problem is adulteration and infusion strength, not star anise in a stockpot.

Can you tell them apart by eye?

Sometimes, imperfectly, and not reliably enough to bet a baby on. In general:

But this only helps with intact whole stars. Broken fragments, and above all ground star anise or pre-bagged "star anise tea," cannot be identified visually at all. Laboratory analysis is the only reliable check, and that is why the practical advice below is about sourcing and use rather than about squinting at pods.

What to actually do

  1. Never give star anise tea to an infant. Not for colic, not for gas, not diluted, not "just a little." There is no benefit that justifies it and there is documented harm.
  2. Do not give star anise tea to young children either. Culinary star anise in a shared family dish is a different exposure entirely and is not the concern.
  3. Buy whole stars from a reputable seller — a supermarket, a well-known spice merchant, an established Asian grocer. Avoid loose, unlabelled, or unknown-origin material, and avoid ground star anise.
  4. Cook with it; do not brew strong medicinal infusions of it. A star or two simmered in a large pot of broth is the traditional and safe use pattern, and it has been for centuries.
  5. If someone has a seizure after drinking a herbal tea, tell the emergency team what they drank. This is a diagnosis that is easily missed and easily made if you mention it.

Safety Second: Star Anise Does Not Treat Influenza

This is the single most persistent myth in the spice aisle, and it is worth dismantling piece by piece because the underlying facts are all true — it is only the conclusion that is wrong.

What is true

Star anise is unusually rich in shikimic acid, an organic acid that plants make as a normal intermediate in the shikimate pathway — the route by which plants build aromatic amino acids. Star anise accumulates enough of it to be worth extracting industrially, and for years the world's supply of pharmaceutical shikimic acid came largely from the Chinese star anise harvest. During the avian influenza scare of the mid-2000s and the 2009 pandemic, demand for the drug oseltamivir (Tamiflu) surged, and news coverage widely reported that most of the world's star anise crop was being diverted to drug manufacture. That was accurate reporting.

What does not follow

Shikimic acid is not an antiviral drug and has no activity against influenza. It is a starting material — a cheap, convenient supply of a particular carbon skeleton with the right stereochemistry. Turning it into oseltamivir takes on the order of ten separate chemical steps in a factory, including reactions that introduce entirely new functional groups and, historically, a hazardous azide intermediate. The part of the oseltamivir molecule that blocks the influenza neuraminidase enzyme — the reason the drug works — does not exist in shikimic acid at all. It is built during synthesis.

Two analogies that make the point stick:

The relationship between star anise and Tamiflu is exactly of that kind. There is no metabolic pathway in the human body that converts dietary shikimic acid into oseltamivir or into anything resembling it.

Two more facts that finish the argument

Shikimic acid is not special to star anise. It is a universal plant metabolite, present in ginkgo, sweetgum, pine needles, coffee, and most fruits and vegetables in smaller amounts. Star anise is merely a commercially convenient concentrated source.

The pharmaceutical industry moved on. Precisely because depending on a single agricultural crop grown in a few provinces is a bad way to secure a strategic drug supply, manufacturers developed fermentation routes using engineered Escherichia coli to produce shikimic acid in bioreactors. That work is well documented in the metabolic-engineering literature. Modern oseltamivir production does not need the star anise harvest.

The bottom line

Drinking star anise tea will not prevent, shorten or treat influenza. If you have influenza and you are in a group at risk of complications — pregnancy, age over 65, chronic lung, heart, kidney or immune conditions — the treatment that helps is an actual antiviral started early, and that means seeing a clinician. Star anise in your soup is a pleasure, not a prophylactic.

Overview

Illicium verum is a small to medium evergreen tree, generally 8 to 15 metres, with smooth grey bark, glossy leathery leaves, and solitary flowers ranging from pale yellow through pink to dark red. It belongs to the family Schisandraceae — the same family as the adaptogenic berry Schisandra chinensis — though older references place it in its own family, Illiciaceae, or lump it near the magnolias. It is a botanically ancient lineage, one of the early-diverging branches of the flowering plants.

The fruit is not a single structure but a ring of individual carpels fused at the centre, radiating outward like the points of a star — usually eight of them, each holding one shiny brown seed. Confusingly for cooks, most of the aroma is in the woody carpel wall, not in the seed.

Fruits are harvested before they ripen, while still green, and then sun-dried until they turn the familiar rust-brown and go hard and brittle. A tree begins bearing at around six years old and may keep producing for a century. Because the spice is dried whole and hard, it keeps its aroma remarkably well — a jar of whole stars stays good for a year or two, far longer than most ground spices.

Names and Identification

Binomial: Illicium verum Hook.f. Family: Schisandraceae. The genus name comes from the Latin illicio, "to entice" — a reference to the smell.

Regional names:

Three different plants that all taste of licorice

This is the ambiguity worth carrying away. Three unrelated plants share the flavour because they share one molecule, anethole:

They are not botanical relatives in any meaningful sense — the resemblance is purely chemical convergence. In cooking they are not straight substitutes: star anise is heavier, warmer and more assertive, and it stands up to hours of simmering in a way anise and fennel do not. Recipes that call for one and get another usually taste wrong rather than merely different.

And the toxic look-alike

See the safety section above. Illicium anisatum, Japanese star anise, is a genuine relative, genuinely similar-looking, and genuinely poisonous. It is the one identification error on this page that has landed people in hospital.

Where It Grows

Star anise has an unusually concentrated geography for a globally traded spice. The overwhelming majority of the world crop comes from a narrow band of subtropical southern China and adjacent northern Vietnam.

Small plantings exist in Laos, the Philippines, Jamaica and India, but they are marginal. This concentration is exactly why the Tamiflu supply question mattered in the 2000s: a global pharmaceutical input depended on the weather in a couple of Chinese provinces.

Trade practice is worth knowing as a buyer. Whole star anise moves in bulk, is repacked many times before it reaches a shelf, and broken carpels and dust from the bottom of sacks are the material most likely to end up in cheap ground spice or bagged tea. Since that is also the material in which adulteration cannot be spotted, "buy whole stars" is both a flavour recommendation and a safety recommendation.

Traditional Use

Traditional use is history and it is culturally meaningful. It is not evidence of efficacy, and virtually none of it has been tested in controlled human trials.

Active Compounds

Star anise fruit yields roughly 5 to 10 percent essential oil, and one compound dominates it overwhelmingly.

trans-Anethole

Typically 80 to 90 percent of the essential oil. This single molecule is star anise's flavour. It is also the dominant compound in aniseed and a major one in fennel, which is why all three taste related. Anethole is roughly thirteen times sweeter than sucrose on the tongue, which explains why star anise reads as "sweet" even in a savoury broth. In laboratory and animal work it shows antispasmodic, antimicrobial and anti-inflammatory activity.

Shikimic acid

Present at several percent of the dry fruit — high enough for commercial extraction, and the reason for the Tamiflu story addressed above. It is a metabolic intermediate with no antiviral activity of its own.

Estragole (methyl chavicol)

A minor constituent, and one worth naming honestly. Estragole is the same compound found in basil and tarragon, and at high doses it is a rodent liver carcinogen; European food-safety assessments have flagged it and recommended limiting exposure to concentrated sources such as essential oils and strong herbal infusions. Culinary use of the whole spice is not considered a meaningful risk. This is a reason not to drink concentrated star anise infusions daily, and not to take star anise essential oil internally.

Veranisatins

A detail most sources omit. Illicium verum itself contains small amounts of sesquiterpene lactones called veranisatins, which are neurotoxic in mice at high doses — the same broad chemical family as anisatin, though far less potent and present in far smaller quantities. This does not make culinary star anise dangerous. It does mean that even genuine, unadulterated Chinese star anise is not a completely inert plant when brewed as a strong infusion for a very small body, and it strengthens the case against infant teas independently of the adulteration issue.

Others

A widely used 2011 review in the Journal of Ethnopharmacology pulls together the botany, traditional use, chemistry and pharmacology of Illicium verum and is the standard reference for this material.

Digestive and Carminative Effects

Mechanism. Anethole relaxes gastrointestinal smooth muscle in isolated-tissue preparations, which is the standard antispasmodic mechanism shared by fennel, anise and caraway. Aromatic volatiles also stimulate salivary and gastric secretion. This is the rationale behind star anise's use for bloating, colic and cramping across every tradition that has used it.

Evidence. Isolated tissue and animal studies for star anise itself; somewhat better human evidence exists for the related plants, particularly fennel-seed preparations. There are no randomised controlled human trials of star anise for digestive symptoms. The European traditional-use monograph is explicitly based on long-standing use, not on trial data, and it says so.

What that means for you. A star anise in a pot of broth is a fine thing and may well settle a heavy meal. The claim is traditional and plausible; it is not demonstrated. Persistent digestive symptoms need investigation, not spice.

Antimicrobial Activity in the Laboratory

Mechanism. Anethole and star anise essential oil disrupt bacterial and fungal cell membranes. In culture, star anise oil inhibits a broad range of organisms, including common food-spoilage bacteria and Candida species, and this is of genuine practical interest to food scientists working on natural preservatives.

Evidence. In vitro, essentially without exception. Studies typically apply concentrated essential oil directly to organisms on a plate at concentrations that could never be achieved in a human body by eating the spice. There are no human trials showing that eating or drinking star anise treats any infection.

What that means for you. Star anise is not an antibiotic and not an antifungal. If you have an infection that needs treating, it needs actual treatment. The laboratory work is legitimate research with a legitimate application — food preservation — and it does not transfer to human therapeutics.

Antioxidant and Anti-Inflammatory Research

Mechanism. The flavonoid fraction — quercetin and kaempferol derivatives — scavenges free radicals in chemical assays, and star anise extracts reduce inflammatory signalling in cell models and in rodents, lowering markers such as TNF-α and interleukin-6.

Evidence. Cell culture and animal models. Rodent studies also report anticonvulsant, analgesic and sedative effects of star anise extracts, which sits oddly alongside the fact that its toxic relative causes seizures — a good illustration of how different two closely related plants can be, and of why "it's natural and related to something useful" is never an argument.

What that means for you. "Star anise is rich in antioxidants" is a true statement about a chemical assay and an unproven statement about your health. No human outcome has been demonstrated. Star anise contributes to a varied, plant-rich diet in the same modest way any aromatic spice does, and that is where the claim should stop.

Culinary Use

This is where star anise genuinely excels, and where its history is deepest.

Technique. Use whole stars and remove them before serving. One to three stars is plenty for a large pot — each whole star weighs roughly a gram, and star anise overwhelms a dish fast, turning medicinal and bitter if overdone. Dry-toast briefly in a pan before adding to release the aroma. Broken pieces work fine for flavour; buy them intact anyway so you can see what you are getting.

Forms and Preparations

Dosage

There is no established therapeutic dose for star anise, because there are no controlled human trials from which to derive one. Anyone giving you a precise medicinal dosage is repeating tradition.

What can be said:

Cautions and Contraindications

Infants — absolute

Do not give star anise tea to infants under any circumstances. Documented cases include seizures, jitteriness, abnormal eye movements, vomiting and an apparent life-threatening event. The risk comes both from adulteration with toxic Japanese star anise and from the small amounts of neuroactive compounds in the genuine spice acting on a very small body. Colic is distressing and it is also self-limiting; there is no version of this trade-off that favours the tea.

Adulteration — everyone

Japanese star anise contamination has repeatedly reached commercial supply. Buy whole stars from established retailers; avoid loose, unlabelled or unknown-origin material and pre-ground powder. If a batch smells weak, green or clove-like rather than sweetly licorice, do not use it.

Seizure disorders

Anyone with epilepsy or a seizure history has an extra reason to avoid star anise infusions entirely, given that the realistic contamination hazard is a GABA antagonist.

Pregnancy and breastfeeding

Culinary amounts in food are considered acceptable. Avoid medicinal infusions and essential oil in pregnancy and while breastfeeding. The reasons are the adulteration risk, the estragole content, and the complete absence of safety data. Star anise tea is used in some cultures to promote milk supply; there is no good evidence it does, and infants can be exposed through breast milk.

Estragole and long-term use

Star anise contains estragole, a rodent hepatocarcinogen at high doses. Occasional culinary use is not a concern. Daily strong infusions or essential-oil ingestion over long periods are a reason for caution.

Drug interactions

Allergy

Rare. People with known allergy to anise or fennel may react to star anise despite the plants being botanically unrelated, because of shared compounds.

The claim to distrust

Any product marketing star anise, star anise tea or shikimic acid as a flu treatment or flu preventive is making a claim that is not supported and not chemically coherent. See the section above.

Key Research Papers

Every citation below has been checked against its PubMed record. Where an identifier could not be verified, a PubMed topic search is given instead, since a search link cannot resolve to the wrong paper.

  1. Ize-Ludlow D, Ragone S, Bruck IS, Bernstein JN, Duchowny M, Peña BM. Neurotoxicities in infants seen with the consumption of star anise tea. Pediatrics. 2004;114(5):e653–e656.
  2. Johanns ES, van der Kolk LE, van Gemert HM, Sijben AE, Peters PW, de Vries I. An epidemic of epileptic seizures after consumption of herbal tea. Nederlands Tijdschrift voor Geneeskunde. 2002;146(17):813–816. (In Dutch.)
  3. Minodier P, Pommier P, Moulène E, et al. Star anise poisoning in infants. Archives de Pédiatrie. 2003;10(7):619–621. (In French.)
  4. Perret C, Tabin R, Marcoz JP, et al. Apparent life-threatening event in infants: think about star anise intoxication! Archives de Pédiatrie. 2011;18(7):750–753. (In French.)
  5. Wang GW, Hu WT, Huang BK, Qin LP. Illicium verum: a review on its botany, traditional use, chemistry and pharmacology. Journal of Ethnopharmacology. 2011;136(1):10–20.
  6. Wei DD, Ge D, Guo PP, et al. A bird's eye view of anisatin-induced convulsive seizures in brain by a 1H NMR based metabolic approach. Molecular BioSystems. 2014;10(11):2923–2934.
  7. Li P, Wei DD, Wang JS, et al. 1H NMR metabolomics to study the effects of diazepam on anisatin-induced convulsive seizures. Journal of Pharmaceutical and Biomedical Analysis. 2016;117:184–194.
  8. Martínez JA, Bolívar F, Escalante A. Shikimic acid production in Escherichia coli: from classical metabolic engineering strategies to omics applied to improve its production. Frontiers in Bioengineering and Biotechnology. 2015;3:145.
  9. Cui YY, Ling C, Zhang YY, Huang J, Liu JZ. Production of shikimic acid from Escherichia coli through chemically inducible chromosomal evolution and cofactor metabolic engineering. Microbial Cell Factories. 2014;13:21.

Live PubMed Searches

  1. Illicium verum pharmacology
  2. Illicium anisatum and anisatin toxicity
  3. Star anise adulteration and detection methods
  4. Anisatin as a GABA receptor antagonist
  5. trans-Anethole pharmacology
  6. Shikimic acid and oseltamivir synthesis
  7. Estragole safety assessment
  8. Veranisatins and neurotoxicity
  9. Star anise essential oil antimicrobial activity
  10. Herbal teas for infant colic and adverse effects

Connections


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