Cilantro Essential Oil in Pregnancy: What Sources Say

No authority I could find has published a pregnancy position on cilantro leaf essential oil, for or against, and we will not invent one. Our oil is sold as an aroma and diluted-skin oil, not as a pregnancy product. What can be done honestly is to show what the published guidance says about essential oils in general, where it disagrees, what our own dilution range looks like next to it, and which questions to bring to the person who is actually responsible for your care.

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Where the sources disagree

The disagreement is not about whether to swallow oils. The guidance I read is unanimous on that. It is about how much of the rest is fine and who decides.

Source	What it says about essential oils in pregnancy
East and North Hertfordshire NHS Trust patient leaflet, version of September 2017	Describes aromatherapy as beneficial in pregnancy "after 12 weeks", warns that some essential oils may be harmful, and advises a qualified aromatherapist or a midwife with complementary-therapy training.
NHS Lanarkshire guideline, approved August 2025	Written for registered midwives who have completed a 2-day accredited course. Pregnancy blends at 1%, maximum 1.5%; labour and postnatal 2%. Do not ingest. Avoid sacral and suprapubic massage and brisk heel massage in the first trimester. Not to be used for neonates.
Tisserand Institute safety guidelines	Lists pregnancy among the situations where you are advised to seek a doctor or suitable practitioner before using essential oils.

Read together, the two NHS documents are not saying the same thing: one frames the second trimester onward as the open door, the other is a clinical protocol with a long exclusion list. Neither names coriander or cilantro. I could not reach ACOG's page on this topic (it returned an access error), so I am not attributing any statement to ACOG.

Our dilution range next to the pregnancy figure

Our shop page gives 0.5% to 2% in a carrier oil for skin, roughly 3 to 12 drops per ounce. The Lanarkshire pregnancy figure is 1%, maximum 1.5%. Using the guideline's own conversion (1% in 5 mL of carrier is 1 drop, so 20 drops per mL), in a 30 mL bottle, which is about an ounce:

1% is 0.3 mL, or 6 drops.
1.5% is 0.45 mL, or about 9 drops.
2%, the top of our range, is 0.6 mL, or 12 drops.

The top third of our own range sits above the only pregnancy figure in these documents. That is arithmetic, not advice: the Lanarkshire number is a protocol for trained midwives, not a self-help rule, and whether any percentage suits you is a question for your midwife or OB-GYN. Because we sell the oil undiluted, the dilution maths is yours, which is why the full method is in how to dilute cilantro essential oil for skin and fabric use.

Coriander the food is not the oil

Searches on this topic tend to blur three different things: eating cilantro, taking coriander seed products, and using a leaf essential oil. The nearest authoritative pregnancy-and-nursing text I found is the NIH LactMed entry on coriander (PubMed 30000851), and it is about seeds, aqueous extracts and supplements, not leaf oil. It reports:

no scientifically valid clinical trials supporting coriander as a milk-supply booster;
coriander is "generally recognized as safe" as a food by FDA, but allergic reactions, photosensitivity and contact dermatitis have been reported;
one case report of a woman nursing a 10-month-old who drank 200 mL of a roughly 10% aqueous extract daily for 7 days and later developed adrenal dysfunction, with the entry noting the verification method and possible contaminants were not stated;
elevated liver enzymes in a woman taking a tea blend containing coriander.

Two case reports are not a rate, and a water extract is not an essential oil, so applying either to our leaf oil is an inference. They do show why "it's a food herb" is not a dose-free answer once the plant is concentrated. Likewise the GRAS point is about food use, which the oil is not (see can you ingest cilantro essential oil). I did not find a European Medicines Agency herbal monograph on coriander I could read, so I am not quoting one.

Inhaled, on skin, swallowed

The routes carry different questions, and I found no data on cilantro leaf oil by any of them.

Swallowed: every guidance document above says no, unless a qualified practitioner directs it.
On skin: the dilution above, a patch test first (see the patch test guide), and your clinician's view on abdominal or first-trimester application. Lanarkshire lists skin allergies and broken skin as contraindications.
Diffused: the least studied route in these documents. Our own copy notes the aroma is divisive and that the oil dominates a blend quickly. Reasoning from that, a pregnancy with strong scent sensitivity is a good reason to skip it altogether, with no medical judgment needed.

The order we would put the decisions in

This is reasoning from the documents above, not a protocol, and it is the order a seller can honestly offer because none of the steps needs a clinical judgment from us:

Is any of the Lanarkshire exclusions yours? If so, or if you are unsure, the answer comes from your clinician before any purchase.
Is the question about swallowing it, putting it on a baby, or using it as a milk-supply or symptom product? Then the answer from every source here is no, or ask a professional. We do not sell it for any of those.
If the remaining question is a room scent or a diluted body oil, decide the percentage with your midwife first, then do the arithmetic above.
Our shop copy suggests the smallest size first because the aroma divides people. In pregnancy that is a practical point: a 0.5 oz bottle is enough to find out whether you can stand the smell, with no dilution, skin contact or diffuser involved.

Questions to bring to an OB-GYN, midwife or pharmacist

Is there anything in my history (the Lanarkshire exclusion list includes epilepsy, hypertension or pre-eclampsia, severe asthma, anticoagulant use, multiple pregnancy, and skin allergies) that rules out essential oils altogether?
Which trimester are we in, and does that change whether you would advise any skin application?
If I use a blend at all, what maximum percentage do you want, and where on the body?
Does anything I take, including supplements, make an aromatic oil a bad idea?
If I am breastfeeding, should I wait, and where should the oil never touch?
Who should I call if I get a rash, headache or nausea after using it?

A lactation consultant can answer the milk-supply question that coriander products raise. For everything else, the person who knows your chart is the one to ask. A baby is a separate question: Lanarkshire excludes neonates, and our kids and children guide covers what is known.

Limits of this page

We sell one product, cilantro leaf essential oil, and we have no clinicians, no pregnancy data and no customer outcomes. Everything above is reporting and arithmetic. The general safety picture, beyond pregnancy, lives in cilantro essential oil safety.