You can make anise oil at home using two main approaches: a simple oil infusion (which extracts anise flavor and some aromatic compounds into a carrier oil) or steam distillation (which produces a concentrated essential oil). The infusion method requires only kitchen equipment and a few weeks of patience, while distillation needs specialized glassware but yields a far more potent product with trans-anethole concentrations between 75% and 90%.
Infusion vs. Distillation: Which Method to Choose
An anise-infused oil is the easier route. You steep crushed anise seeds in a carrier oil like olive or sweet almond oil, and the oil gradually absorbs the aromatic compounds. The result works well for cooking, body care, or homemade remedies, though it will never be as concentrated as a true essential oil.
Steam distillation, on the other hand, separates the volatile essential oil from the plant material using heat and condensation. This produces pure anise essential oil, the kind you’d find in a small dark bottle at a health store. It requires more equipment and attention, but the end product is highly concentrated. The dominant compound in anise essential oil, trans-anethole, typically makes up 83% to 93% of the final oil depending on extraction technique.
How to Make Anise-Infused Oil
This is the most accessible method for home use. You’ll need whole anise seeds (or star anise), a carrier oil, a clean glass jar with a lid, cheesecloth or a fine mesh strainer, and dark glass bottles for storage.
Preparing the Seeds
Crushing the seeds before infusion is important. Finely ground anise releases significantly more oil than whole seeds. Research on star anise extraction found that particle size was the single most significant factor affecting oil yield, with finely ground material (smaller than about 0.4 mm) producing the best results. You don’t need to measure particle size at home, but grinding the seeds thoroughly in a mortar and pestle or spice grinder makes a real difference. One thing to note: if you’re using star anise, avoid over-grinding the actual seeds inside the pods. The seeds contain very little volatile oil and can reduce both yield and quality. Focus on crushing the star-shaped fruit itself.
Cold Infusion Method
Fill a clean glass jar about one-third full with your crushed anise seeds. Pour your carrier oil over the seeds until the jar is nearly full, making sure the seeds are completely submerged. Seal the jar tightly, place it in a sunny, warm windowsill, and shake it once a day or more. After two to three weeks, strain the oil through cheesecloth or fine muslin draped over a strainer, squeezing out as much oil as possible. Pour the finished oil into clean, dry glass bottles, label them with the date and contents, and store in a cool, dark, dry place. Cold-infused oils generally keep for up to a year when stored properly.
Warm Infusion Method
If you want faster results, gentle heat speeds the process considerably. Combine crushed anise seeds and carrier oil in a heat-safe jar or double boiler, then warm the mixture over very low heat, keeping the temperature between 100°F and 140°F. Maintain this for one to five hours until the oil takes on a strong anise scent. Some recipes call for holding the oil at around 100°F for 48 to 72 hours using a slow cooker or yogurt maker on its lowest setting. Once cooled, strain through cheesecloth into sterilized glass bottles. This method produces a more aromatic oil in a fraction of the time, though you need to watch the temperature carefully. Oil that gets too hot can degrade the delicate aromatic compounds.
How to Make Anise Essential Oil by Distillation
Steam distillation produces true anise essential oil. A standard home setup consists of a hot plate, a boiling flask (for generating steam), a biomass flask (holding the crushed anise), a still head, a condenser, and a receiver to collect the distillate. Home distillation kits designed for essential oils are widely available online and include all these components in glass.
Setting Up the Equipment
Fill the boiling flask with water and pack the biomass flask with your crushed anise seeds. Connect the condenser and run cold water through it. The condenser cools the steam back into liquid as it passes through, and the water draining from the condenser outlet should feel cool or at most lukewarm throughout the process. If it starts to feel warm, increase the cold water flow rate. Place a glass receiver or separating funnel at the outlet to catch the condensed liquid.
Running the Distillation
Turn the hot plate to a high setting to bring the water to a vigorous boil. Steam rises through the crushed anise, picks up the volatile oil compounds, travels through the still head into the condenser, and drips into your receiver as a mixture of water and essential oil. Because anise oil is slightly denser than water and doesn’t mix with it, the oil will separate naturally in the receiver. You can then carefully collect the oil layer.
Extraction time matters, but more isn’t always better. Research found that a one-hour distillation with finely ground material produced oil with the highest purity of trans-anethole (around 96.6%), while running the process for three hours increased total yield but degraded the quality of the key aromatic compound. For home use, one to two hours is a reasonable target that balances yield and quality.
Yield Expectations
Don’t expect large volumes. Under optimized laboratory conditions using star anise, researchers achieved a yield of about 10% by weight, meaning 10 grams of oil from 100 grams of dried, finely ground fruit. Home setups are less efficient, so a realistic yield is lower. You’ll typically get a few milliliters of essential oil from a substantial amount of seed material. This is normal for essential oil production and is why commercially distilled oils carry a significant price per ounce.
Storing Your Anise Oil
Both infused oils and distilled essential oils degrade when exposed to light, heat, and air. Store your finished oil in dark glass bottles (amber or cobalt blue) with tight-fitting caps. Keep them in a cool, dark, dry location. Infused anise oils stored this way last six months to a year. Pure distilled anise essential oil, because it contains minimal water or carrier oil that could go rancid, lasts considerably longer when stored correctly.
Label every bottle with the date, the type of anise used, and whether it’s an infusion or essential oil. This distinction matters because essential oil is far more concentrated and should never be applied directly to skin without dilution in a carrier oil, while an infused oil is already diluted and ready to use.
Anise Seed vs. Star Anise
Both anise seed (from the parsley family, native to the Mediterranean) and star anise (from an evergreen tree native to China) contain trans-anethole as their primary aromatic compound, which is why they smell and taste so similar. Either works for making anise oil. Star anise is often preferred for distillation because the dried fruits are larger, easier to handle, and widely available at low cost. For infusions, regular anise seeds work just as well and produce a slightly different flavor profile that some cooks prefer. Whichever you use, buy whole seeds or fruits rather than pre-ground, and grind them yourself right before extraction for the strongest results.