Anise.
Anise seed is a warming digestive spice. Its oil, almost all anethole, is what people reach for after a heavy meal, and it makes a herbal blend taste like something you want to drink.
- Category
- Herb
What Anise is, and what it does.
- Does it work
- Suits people who feel gassy or heavy after big meals, and anyone who wants a caffeine-free evening drink. It also carries the flavour in blends that would otherwise taste medicinal.
- How much to take
- No dose figure is on record for anise, so we won't invent one. Start with culinary amounts: a teaspoon of seed in cooking, or a cup of infusion after a meal.
- Time to feel it
- This is a same-sitting ingredient. A warm infusion is usually noticed while you drink it, though nobody has measured a precise onset time in a trial.
- The first dose
- Day one is a sweet, liquorice-like drink and, for a lot of people, a settled feeling after a heavy meal. Nothing is accumulating yet.
- With regular use
- Weeks of daily use mostly repeat the same after-meal effect rather than building on it. Nobody has measured what regular seed or tea use does to any blood marker.
- How well tolerated
- Widely eaten as a spice and well tolerated at food amounts. Concentrated oil is much stronger, labels often confuse it with star anise, and pregnancy is worth a clinician check.
- How it feels
- Sweet, liquorice-like and warming. Most of the experience is taste and the calm of a hot drink, not a sharp effect you could point to.
- The overlooked benefit
- Anethole barely dissolves in water, so a cup of tea carries a fraction of what the distilled oil holds. That gap explains why the tea and the oil behave so differently.
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
- digestive comfort after mealsRandomised trial
- comfort across the monthly cycleRandomised trial
- temperature comfort during the midlife hormonal shiftRandomised trial
- antioxidant activity of the seed oil in laboratory assaysIn vitro study
- anethole as the dominant volatile of the seed oilNarrative review
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
Anise and fennel share trans-anethole as the principal volatile constituent, which is why they taste alike and why traditional carminative blends use them together. Combining them raises total anethole exposure rather than adding a second mechanism. Formulators should count the anethole load across both, not per herb. This is compositional chemistry, not a clinical finding.
Menthol and anethole both reduce contractile tone in isolated gut tissue work, which is the mechanistic basis for the classic after-meal tea. Peppermint oil has far more human data behind it than anise does. The combination is common in commercial digestive blends but has not been isolated in trials, so the shared mechanism is inferred, not measured.
Ginger gingerols influence gastric emptying, while anise volatile oil acts more on smooth-muscle tone. The two routes differ, so the pairing is complementary rather than duplicative. Human evidence exists for ginger alone and is much weaker for anise alone, and none isolates the pair.
Chamomile brings flavonoids led by apigenin, anise brings a phenylpropene volatile oil. Both survive hot-water infusion to different degrees, with anethole extracting poorly into water because it is lipophilic. The pairing is culinary and traditional. Read it as flavour and custom with a plausible chemical rationale, not as a demonstrated additive effect.
Licorice and anise are often blended because glycyrrhizin sweetness and anethole aroma reinforce each other, which reduces the need for added sweeteners. The pairing is a flavour and formulation decision first. Licorice carries its own dose ceiling because glycyrrhizin affects potassium handling and blood pressure at sustained intakes, so the blend inherits that limit.
Anise essential oil degrades on exposure to light, heat and air, and anethole content falls as the oil oxidises and polymerises. Tocopherols are the standard antioxidant added to protect the oil phase in soft gels and liquid blends. This protects the product, not the person taking it. The pairing is formulation convention.
Charcoal adsorbs a wide range of small lipophilic organic compounds, and volatile oil constituents such as anethole fall into that class. Taken in the same window, charcoal would be expected to reduce how much anise oil constituent stays available in the lumen. Separating the two by a couple of hours is the usual way around it. The interaction is a general property of charcoal rather than something measured for anise specifically.
Nothing specific on file for Anise. Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.What Anise actually does.
The smell and taste of anise come almost entirely from one compound called anethole.
Anise tea is much weaker than anise oil, because the active aroma compound does not dissolve well in water.
Anise oil goes off. Light and air degrade it, so storage matters.
Whole seed and essential oil are not the same product in a different shape.
Where Anise comes from.
Anise is a seed from a plant in the carrot family. Nearly all of what it does comes from one aromatic compound. Star anise is a different plant with a similar smell, so labels and studies get mixed up constantly.
Made from a plant. What ends up in the capsule tracks the harvest, so batch testing and a stated marker matter more here than with a made molecule.
The dried ripe schizocarp, usually called seed, of an annual Apiaceae plant grown mainly in Turkey, Egypt, Spain, Syria and Iran.
Steam distillation of crushed seed yields the essential oil. Hydroalcoholic percolation yields a broader extract that also carries non-volatile constituents.
The oil phase is separated from the aqueous distillate. Liquid extracts are concentrated and dried onto maltodextrin or a similar carrier.
Gas chromatography is used to declare trans-anethole content, the usual specification point for anise oil.
Blended into teas, encapsulated, or filled into soft gels with an antioxidant to slow oxidation.
Getting Anise from food.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
The forms it comes in.
The essence, in one line each.
- Reported effects of a Pimpinella anisum herbal tea on expressed milk volume and on infant weight gain over the study period.Randomised trial. Khalili S et al., 2023 (BMC Complementary Medicine and Therapies). PMID 36681821 ↗
- Dietary anise (Pimpinella anisum) oil was associated with changes in growth performance, blood parameters and muscle nutrient content.Animal study. Tok S et al., 2025 (Veterinary Medicine and Science). PMID 40454886 ↗
- Dietary star anise during late gestation and lactation was linked to differences in sow and litter performance measures.Animal study. Moon JH et al., 2025 (Animal Bioscience). PMID 40045608 ↗
- Compared in vivo and in vitro responses to phytogenic feed additives, including anise-type volatile constituents, on gut and growth measures after weaning.Animal study. Weitmann A et al., 2025 (Animals). PMID 40509127 ↗
- Medicinal plant powder blends containing anise among other botanicals were assessed for growth performance outcomes in a livestock feeding trial.Animal study. Cong ON et al., 2022 (Tropical Animal Health and Production). PMID 35122524 ↗
- Profiled digestibility and tissue transcriptomic responses in birds supplemented with a phytogenic blend that includes anise.Animal study. Reyer H et al., 2026 (Poultry Science). PMID 41418532 ↗
- Untargeted metabolomics detected shifts associated with essential oil blends containing anise-type constituents fed alongside an organic acid.Animal study. Alabi JO et al., 2025 (Metabolites). PMID 41149658 ↗
These are the studies our verdict leans on, chosen from the 7 we read for Anise. The full linked list is below.
The studies, linked.
7 sources behind our Anise verdict: peer-reviewed studies and registered clinical trials. Every one links straight to PubMed, the journal, or ClinicalTrials.gov. Read them yourself.
- Clinical trialImpact of Different Treatment Modalities on Immunity Against COVID-19ClinicalTrials.gov ↗Phase 2, 150 participants, Completed
- Clinical trialRandomised Clinical Trial: Enteric-coated Anise-oil Capsules vs. Placebo & Active Controlled in Irritable Bowel Syndrome - A 4 Week Double-blind Study With 2 Weeks Follow-upClinicalTrials.gov ↗Phase 3, 120 participants, Completed
- Clinical trialRandomized Controlled Double-blinded Clinical Trial of an Herbal Mouthrinse for Radiotherapy Induced Mucositis in Cancer PatientsClinicalTrials.gov ↗Phase 2, 50 participants, Completed
- Clinical trialEvaluation of Antibacterial Potency of New Different Herbal Mouthwashes Against Caries Forming Bacteria, a Randomized Control TrialClinicalTrials.gov ↗Phase 4, 90 participants, Unknown
- ClinicalTrials.gov ↗
- Clinical trialBeneficial Effects of Herbal Tea on Lipid Profile, Insulin Resistance, CRP, CBC, Liver, and Kidney Function Tests, and Anthropometric Indices in Jordanian AdultsClinicalTrials.gov ↗30 participants, Unknown
- Clinical trialANIfrolumab Treatment for 24 Weeks in Patients With Primary Sjögren's Syndrome - Efficacy and Safety Assessment in a Randomized, Double-blind, Placebo-controlled Phase-IIa Proof-of-concept Trial (ANISE-II)ClinicalTrials.gov ↗Phase 2, 30 participants, Unknown
Evidence surfaced via Semantic Scholar (Allen Institute for AI) and ClinicalTrials.gov. Ranked by study type and citation weight, not cherry-picked.
Problems people have reported.
Read this carefully. These are 9,668 voluntary, unverified reactions reported to the FDA (openFDA). The number mostly reflects how popular Anise is, not how risky it is. A report is not proof Anise caused anything. It is a signal of what to watch for, nothing more.
Source: openFDA adverse-event reports. Voluntary reporting, not an incidence rate.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.