Chamomile Essential Oil Safety: Who Should Skip It, and Why
The risks that show up in the literature for chamomile oil are not exotic toxicity. They are an allergy that some people carry without knowing it, and an open bottle in a house where someone small can reach it. This guide is ordered the way we would walk a buyer through the decision: are you in the allergy group, what is the dilution maths, how do you test, and where does the bottle live. We sell two chamomile essential oils, German and Roman, both undiluted, so the dilution step is yours to do.
Roman Chamomile Essential Oil
Our own Roman Chamomile Essential Oil, in sizes from 0.5 oz to bulk.
From $32.99
Shop Now →Step 1: Are you in the group that should not start?
Both chamomiles belong to the daisy family (Asteraceae, also called Compositae). The NCCIH chamomile page says people allergic to related plants such as ragweed, chrysanthemums, marigolds and daisies may be more likely to react to chamomile. The European Medicines Agency draft assessment for Roman chamomile (EMA/HMPC/560906/2010, draft, 2011) says Roman chamomile "possesses a small potential for sensitization" and should be avoided by people with a known hypersensitivity to Asteraceae. That is the one point where every authority we fetched agrees.
Be careful with how far the ragweed link goes. The EMA draft for German chamomile (EMA/HMPC/55837/2011, draft, 2014) cites a figure of about 3.1% Asteraceae allergy among 3,851 adults who were referred for allergy testing (Hausen, 1996), and 56% of those were allergic to matricaria. That is a tested, already-symptomatic group, so it is not a rate for the general public. The ragweed cross-reactions in the case reports it lists involve tea and tea-containing enemas, not essential oil on skin. Our reading: the link is real enough that a ragweed or mugwort allergy is a reason to see an allergist before opening a bottle, but no source we fetched measured how often it shows up with a dilute oil.
Neither species is the "low allergy" pick. DermNet lists both as allergenic, naming nobilin as the allergen in Roman chamomile and desacetylmatricarin in German chamomile, both sesquiterpenes. DermNet also reports a trial of nightly massage in children with atopic eczema, comparing plain oil with essential oils: both groups improved, and some children in the essential oil group worsened through allergy to the oils, chamomile among them. We choose not to say one of our two oils is milder than the other, because nothing we fetched supports it.
Step 2: Do the dilution maths, and know what we could not verify
Our product pages say 0.5% to 2% in a carrier oil, roughly 3 to 12 drops per ounce on the German page. The arithmetic behind that: one US fluid ounce is 29.57 ml, and at the common convention of 20 drops per ml that is about 590 drops, so 1% is about 6 drops per ounce, 0.5% about 3 and 2% about 12. Drop size varies with the bottle and the oil, so measuring in ml is more reliable than counting.
Here is the part we cannot paper over. The Tisserand Institute publishes a chart of recommended dilutions by age, drawn from Essential Oil Safety 2nd edition, and its adult band (over 15 years) is 2.5% to 5% (Tisserand Institute, 2017). That chart does not name chamomile, and the book's chamomile entries were not retrievable for us, so we cannot give you a chamomile-specific maximum from Tisserand and Young. Secondary websites quote figures ranging from no restriction to 2% to 4%, which is exactly why we do not repeat them. Our 0.5% to 2% sits below the generic adult band; it is our own product-page range, not a published chamomile limit. If you formulate for sale, check the current standards for your product type instead of relying on a retail page.
Step 3: Patch test before the first real use
Allergic reactions to chamomile can be delayed. In the case reports summarised by the EMA, patch-test readings were taken at day 2 and day 4. The Tisserand Institute's safety pages note that an irritant reaction can appear within 5 or 10 minutes of applying an oil. So one quick dab and a glance is not a test. The same EMA draft describes two breastfeeding women with nipple dermatitis after using an ointment that contained Roman chamomile oil (McGeorge and Steele, 1991); both had a strong reaction (+++) to chamomile oil at 0.1% on patch testing, and the EMA itself calls the product identification questionable. Taken at face value, a sensitised person reacted at a strength five times below our 0.5% floor, which is the practical reason dilution does not rescue someone who is already allergic. We walk through the method in our patch test guide.
Step 4: Where it goes, and where it does not
- Eyes: NCCIH lists eye irritation as a possible effect of chamomile used near the eyes. Keep the bottle and your oiled fingers away from them.
- Swallowing: not an option for essential oil. See our ingestion article. In the US, Poison Control is 1-800-222-1222, free and open 24 hours (poison.org).
- Light: the EMA Roman chamomile draft reports no photosensitising effect observed for the coumarins isolated from the plant (Barnes et al., 2002). That concerned the plant's coumarins rather than our bottle, so treat it as a reason for less worry about sun, not as a guarantee.
- Old oil: we found no source on oxidised chamomile oil and sensitisation, so we make no claim. Our product pages give a typical shelf life of 2 to 3 years, stored capped, cool and dark.
The one-glance matrix
| Who | What the sources say | Who to ask |
|---|---|---|
| Healthy adult, no daisy-family allergy | Dilute, patch test, keep out of eyes. No authoritative chamomile-specific maximum retrieved. | Pharmacist for label or drug questions |
| Daisy-family or ragweed allergy | NCCIH and EMA both flag a higher chance of reacting. | Allergist or dermatologist, before first use |
| Pregnant or breastfeeding | NCCIH: little is known. EMA: no formal studies for Roman chamomile. | OB-GYN or midwife; see our pregnancy article |
| Baby or child | Tisserand chart starts at 0.1% to 0.2% under 3 months; our pages say keep away from children. | Pediatrician; see our children's article |
| Dog or cat in the home | We cite no pet source here. | Veterinarian; see dogs and cats |
| Taking warfarin or other regular medicines | One case report, in-vitro enzyme data; mostly tea or extract. | Pharmacist; see our side effects article |
Who should skip it
Skip our oils if you have a known allergy to chamomile, ragweed-family plants or sesquiterpene lactones, if you cannot keep the bottle where children and pets cannot reach it, or if you were hoping for something to swallow or to use on a baby. We sell oil, not medical advice, and we make no health claims for it. For any of the people in the matrix above, the professional in the right-hand column makes the call, not a product page.
Roman Chamomile Essential Oil
Roman Chamomile Essential Oil from our own shop, in sizes from 0.5 oz to bulk.
From $32.99
Shop Now →Sources & Further Reading
- NCCIH. Chamomile. nccih.nih.gov/health/chamomile
- EMA HMPC, 2011 (draft). Assessment report on Chamaemelum nobile (L.) All., flos. ema.europa.eu, EMA/HMPC/560906/2010
- EMA HMPC, 2014 (draft). Assessment report on Matricaria recutita L., flos and aetheroleum. ema.europa.eu, EMA/HMPC/55837/2011
- Tisserand Institute, 2017. Recommended dilutions for children. tisserandinstitute.org
- Tisserand Institute. Safety Pages. tisserandinstitute.org/?p=6690
- Poison Control (American Association of Poison Control Centers). Essential oils. poison.org/articles/essential-oils