Is your fennel oil sweet or bitter?

Our shop describes it as sweet fennel, "the variety we bottle". The certificate of analysis we publish for one batch (FENCSAFVUSC004A) names only the species, Foeniculum vulgare. It does not name a variety and gives no anethole or estragole figure, so the certificate alone does not confirm sweet fennel. This matters because the label does not fix the chemistry. The European Pharmacopoeia treats sweet and bitter fennel as separate fruit varieties, but published oil ranges overlap: EFSA's sweet fennel specification allows 2.0-6.0% estragole, and a 2024 study of five authentic distillates averaged 17.0% (EFSA FEEDAP Panel, 2023; Murphy et al., 2024). If the variety or estragole figure decides your purchase, ask us in writing through the contact page for the figures for the lot you will receive, and check what comes back. More in sweet vs bitter fennel oil.

How much fennel oil can go on skin?

Our shop's guidance is to dilute at 0.5% to 2% in a carrier oil and patch test before regular use, which works out to roughly 3 to 12 drops per ounce of carrier. Our How It's Made page is more cautious and says to keep fennel dilutions low and well under what you would use for a citrus. We read the second as the better guide and 2% as an upper edge. The reason is estragole, a minor component. IFRA's standard limits it to 0.075% of a finished body oil or lotion (Category 5A; Amendment 49, 2020, later amendments not checked) (IFRA Standard: Estragole). Dividing by an oil's estragole share gives a ceiling of about 2.0% fennel oil at 3.76% estragole, about 1.25% at 6.0% and about 0.44% at 17.0%. We cannot tell you which applies to your bottle without a lot figure. Wait 24 hours after a patch test, as our shop says. The arithmetic is in skin basics.

Can I use fennel oil if I am pregnant or breastfeeding?

Our How It's Made page says fennel oil should be avoided entirely in pregnancy and while breastfeeding, and that it is not appropriate for children. We hold to that. It also says anyone with an oestrogen-sensitive condition or epilepsy should leave it alone. A question about a specific pregnancy, a nursing baby or a medical condition belongs with an OB/GYN, midwife, lactation consultant or physician, not with an oil seller. The longer discussion is in fennel oil in pregnancy and breastfeeding.

Can I swallow fennel essential oil?

No. Our shop says the oil is a concentrated botanical extract and not meant for internal use, and we do not suggest adding it to water, tea or food. Fennel seed in cooking and a distilled oil are different materials: at the pharmacopoeial minimum yield of 20 mL of oil per kilogram of sweet fennel fruit, one drop of oil stands for the oil from at most about 2.5 g of seed (our arithmetic from the figure in the European Medicines Agency's 2024 report). If someone has swallowed essential oil, contact poison control or a physician. For a medical reason to use fennel, ask a physician or pharmacist. The long answer is in can you swallow fennel essential oil.

Do you publish a certificate of analysis?

We publish one, for one batch. It lists the product name, botanical name, CAS number 8006-84-6, part used (seed), steam distillation, a best-by date of 06/15/2028, appearance and smell against stated standards, a relative density of 0.975 at 20 C (standard 0.965 to 0.980) and a refractive index of 1.546 at 20 C (standard 1.541 to 1.551), with a conclusion that the tested parameters comply. It does not list variety, anethole, estragole, fenchone, GC/MS, origin, the laboratory's name or any safety data, and it covers one batch, not every lot. Our How It's Made page says we will send the anethole and estragole figures for the lot you hold. We would ask for those in writing and read them before relying on them. For what a good report contains, see the buying guide.

How long does fennel oil keep?

Our shop says it is typically stable for 2 to 3 years when the bottle stays sealed, away from heat and sunlight. We quote that as the shop's statement and do not derive a shelf life from the certificate's best-by date. Published work points the same way for essential oils in general: a 2026 review in Plants reports that oxygen, heat and light accelerate oxidation and that dark storage slows it (Gcabashe et al., 2026); it is not specific to fennel. Reasoning from that, keep the cap tight and the bottle in a cupboard, and treat any oil that smells different as finished. Details are in how to store fennel oil.

Do you sell fennel oil in bulk?

Yes. Our shop lists sizes from 0.5 oz to 400 lb, says larger quantities are available by contacting us, and says there is no separate bulk grade: every size is the same oil from the same lots. Samples start at 0.5 oz. Bulk buyers should start at the bulk page or the wholesale page. We do not quote prices in articles. Whatever size you choose, the questions above apply: ask for the variety and the lot's estragole figure in writing before you rely on either.

Fennel Essential Oil FAQ: Straight Answers

Q: What do you sell, and how is it made?

We sell one product: Fennel Essential Oil, Foeniculum vulgare, steam-distilled from crushed seed and bottled undiluted, in amber glass. We do not sell bitter fennel oil, fennel hydrosol, fennel seed, other essential oils, blends, carrier oils or diffusers. Our shop offers sizes from 0.5 oz to 400 lb, and says every size is the same oil bottled from the same lots. Our How It's Made page describes the process: the seed is cracked in a mill in the hour before it meets steam, steam is passed through it until it is spent, and nothing is timed. Our home page says the seed heads are gathered from Mediterranean fields once ripe and dried. We do not name a country or a farm, and we do not claim the oil is wild-harvested or organic. The process is covered in how fennel oil is made.

Fennel oil smells like a sweet licorice candy wrapped around warm, peppery herbs, and it raises more questions than most bottles on the shelf. Here are the ones we hear most, answered the way we would at a counter. Where a question is really a medical one, we say so and point you to the right person.

Fennel Essential Oil

Our own Fennel Essential Oil, in sizes from 0.5 oz to bulk.

From $13.99

Shop Now →

What do you sell, and how is it made?

One oil: Fennel Essential Oil, Foeniculum vulgare, steam-distilled from crushed seed and bottled undiluted in amber glass. It comes in sizes from 0.5 oz up to 400 lb, and every size is the same oil bottled from the same lots. We do not sell carrier oils, blends, hydrosol or diffusers, so for those you will want a craft or supply shop. If you like the process side, how fennel oil is made walks through it.

Is it sweet or bitter fennel?

We bottle sweet fennel, the milder and more fragrant of the two. The label alone does not settle the chemistry, though. Published ranges for the two kinds overlap, and one 2024 authentication study found five authentic fennel distillates averaging 17% estragole, far above the 2% to 6% in the sweet fennel specification EFSA reviewed. So if variety or estragole matters for what you are making, ask us in writing through the contact page for the figures on the lot you will receive. We cover the difference in sweet vs bitter fennel oil.

How much can go on skin?

Our guidance is 0.5% to 2% in a carrier oil, which is roughly 3 to 12 drops per ounce, with a small patch test first. We lean toward the low end, and here is the reasoning. The fragrance industry limits estragole in a body oil or lotion to 0.075%. Divide that by the estragole share of the oil and the ceiling for fennel comes out near 2.0% for an oil with 3.76% estragole, 1.25% at 6%, and 0.44% at 17%. Starting at 0.5% fits under all three. The full arithmetic is in fennel oil on skin.

Pregnant, breastfeeding, or caring for a child?

We say to avoid fennel oil entirely in pregnancy and while breastfeeding, and it is not appropriate for children. The same goes for anyone with epilepsy or an oestrogen-sensitive condition. Questions about your own situation belong with your OB/GYN, midwife, lactation consultant or physician. There is more in fennel oil in pregnancy and breastfeeding.

Can I swallow it?

No. It is a concentrated botanical extract meant for external and aroma use only. Fennel seed in a curry and a distilled oil are very different amounts of the same plant: at the European minimum of 20 mL of oil per kilogram of sweet fennel fruit, a single drop represents the oil from at most about 2.5 g of seed. That is our own arithmetic from the European Medicines Agency figure. If someone has swallowed essential oil, call your poison center (1-800-222-1222 in the US) or a physician. More in can you swallow fennel essential oil.

What does your Certificate of Analysis show?

The one we publish covers a single batch and lists botanical name, seed as the part used, steam distillation, a relative density of 0.975 and a refractive index of 1.546, each inside its stated range. If you need GC-MS detail such as anethole and estragole, ask us in writing before you order and we will tell you what we can send for your lot.

What does it smell like?

Sweet and licorice-like first, then earthy, peppery and herbaceous underneath. Open the bottle and you'll notice the sweetness right away, and the drier, greener part arrives a moment later. We think of it as a top to middle note, and it is more present than many people expect from a few drops.

A woman's hands setting the lid back onto a small white ultrasonic diffuser on a sideboard, the first wisp of mist rising

What goes well with it?

Lavender, rose, sandalwood, bergamot, black pepper, geranium and citrus all sit nicely beside it. We sell fennel oil only, so you would find those elsewhere. If you're curious how pairings work, what blends well with fennel goes through them.

Can I get a sample, or a private label?

Samples start at 0.5 oz, and for private label we fill and cap in-house on an automated line built for oil production. Custom formulations are available on request. The wholesale page has the details, and orders ship in 1 to 2 business days from our US-based facility.

How many drops in a diffuser?

Your diffuser's manual is the best guide, and fewer is better. Start with a small number, keep the room ventilated, and add one drop at a time if you want more. Fennel's sweetness carries a long way.

Can I use it in soap or bath salts?

Cold-process soap and bath salts are two popular ways to use it, and we have written up both, with the arithmetic done for you, in the soap post and the bath salts post. Work out your percentage first, keep it modest, and remember that the aroma is sweet enough that a little goes a long way.

How should I store it?

Capped tight, in a dim spot that stays at a steady temperature, away from heat and sunlight. We describe the oil as typically stable for 2 to 3 years while sealed. Once opened, air starts to matter, and our storage guide explains how to slow it down.

Anything we did not cover here is worth asking us directly. We would rather answer one more question than have you guess.