Essential Oils · Spices
Cinnamon Oil: Benefits, Uses, How to Dilute & Side Effects
What cinnamon bark and leaf oils are, what the studies show for yeast in the mouth and period cramps, how to dilute it for your skin and use it in a diffuser, and who should skip it.

Why this score?
Its skin reactions hold it down; larger trials of the oil on the skin would raise it. Weighting: Evidence 30% · Traditional Medicine 25% · Clinical Effectiveness 25% · Safety 20% (4.5×0.30 + 7.4×0.25 + 5.6×0.25 + 4.6×0.20 = 5.52, shown as 5.5). How we score
Interaction check: Low on the skin or in a diffuser; Moderate by mouth. On the skin or in a diffuser, no medication interactions are documented for cinnamon oil. By mouth, two kinds of medicine need care. If you take blood sugar medication, treat the oil like the spice and follow the advice in the blood sugar section above. And in a study in mice and rats, large oral doses of cinnamaldehyde, bark oil's main compound, lengthened bleeding and clotting times and made platelets less likely to clump, so if you take warfarin or another blood thinner, skip cinnamon oil by mouth unless your prescriber okays it.35 Interactions are rated separately and don't change the score.
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Cinnamon oil is the essential oil steam-distilled from the bark or leaves of the cinnamon tree, a hot, warming oil that stops yeast and bacteria in lab tests.1234 In a randomized trial of 36 people with oral thrush, a cinnamon-oil rinse and spray cut Candida on the mouth lining by 61% in 15 days, and in a randomized trial of 95 students with painful periods, massage with a blend that included it shortened their pain.56
- On your skin: no more than 1 drop in a tablespoon of carrier oil, after a patch test78
- In a diffuser: 1 to 2 drops, in a well-ventilated room
- By mouth: about 1 drop of a food-grade cinnamon bark oil in honey or a smoothie, for up to two weeks; adults only, and not in pregnancy
- For blood sugar: use ground Ceylon cinnamon, the spice9
- Skip it on your skin: in pregnancy, with a fragrance or cinnamon allergy, and on children
Cinnamon oil comes from the same tree that gives you the spice in your kitchen.1 Open a bottle and the scent fills the room, sweet and hot at once. On your skin it brings real warmth.
That warmth comes with a long medical history and a growing body of research. In randomized trials, cinnamon oil has eased thrush as a mouth rinse and shortened period pain in a massage blend, and in lab tests it stops yeast and bacteria, including as a vapor.5634 The bark behind it holds a place in both traditional Chinese medicine and Ayurvedic medicine.10
On my show, I've ranked cinnamon bark number two among the best essential oils for a parasite cleanse, because it inhibits the growth of certain parasites along with yeast and bad bacteria.11 It's also a hot oil, and that shapes everything about how you use it.2
Oils like oregano and cinnamon, these are very hot and peppery oils to where you want to mix them with a carrier oil like coconut oil, MCT oil, jojoba oil, and then use it directly on the skin.Dr. Josh Axe, DC, DNM, CNSFrom Dangers of Essential Oils: Top 10 Essential Oil Mistakes to Avoid | Dr. Josh Axe, The Dr. Axe Show (2017), at 5:05
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The FDA lists cinnamon bark oil and cinnamon leaf oil, from Ceylon, Chinese and Saigon cinnamon, among the essential oils generally recognized as safe (GRAS) for their intended use as food flavorings.12
In China, cinnamon is a key ingredient in more than 500 patent medicines.10
In lab tests of 10 essential oils and a blend against bacteria taken from patients, including drug-resistant strains, cinnamon bark oil cleared the widest zone of any oil against Pseudomonas aeruginosa, and it ranked with oregano and thyme oils against the gut bacteria in that panel.13
What is cinnamon oil?
Cinnamon oil is the essential oil steam-distilled from the bark or the leaves of the cinnamon tree, and bark oil and leaf oil are different oils: bark oil averages 69.0% cinnamaldehyde, while leaf oil averages 79.0% eugenol.1
True cinnamon, Cinnamomum verum (also called Cinnamomum zeylanicum or Ceylon cinnamon), is native to Sri Lanka.1 The part of the tree decides the oil. In 5 batches of each oil from Sri Lanka, analyzed for a European food-safety review, cinnamaldehyde, the compound behind cinnamon's flavor and bite, made up 69.0% of bark oil on average and just 0.86% of leaf oil, while eugenol made up 79.0% of leaf oil and 6.43% of bark oil. Neither oil contained detectable coumarin.1
| Cinnamon bark oil | Cinnamon leaf oil | |
|---|---|---|
Cinnamaldehyde | 69.0% (64.7% to 70.8%), the main compound | 0.86% |
Eugenol | 6.43% | 79.0% (76.1% to 82.6%), the main compound |
Coumarin | Not detected | Not detected |
Cinnamaldehyde: 69.0% of bark oil, 0.86% of leaf oil
Cassia oil comes from a different tree, Cinnamomum cassia, also called Chinese cinnamon.10
Distilled from the leaves and rich in eugenol. It's diluted the same way as bark oil.1
The kitchen spice, the form for blood sugar. Its research lives on the cinnamon benefits page.
A short history of cinnamon oil
Cinnamon bark has been medicine for a very long time. Classical Chinese herbal texts, including Shen Nong's Materia Medica, recorded the medicinal properties of cassia, and Ceylon cinnamon has been widely used in Ayurvedic medicine across South Asia.10 Cinnamon was also a traditional tooth powder and a remedy for toothaches, dental problems and bad breath,14 and modern trials have since tested it in the mouth. As I've noted on my show, the holy anointing oil of ancient Israel blended cinnamon and cassia with calamus, myrrh and olive oil.15 The distilled oil is the newer, concentrated form of that same bark.
Cinnamon in traditional Chinese medicine {#tcm}
Chinese medicine treats cinnamon as a warming herb, a remedy for complaints that come with cold: cold-induced pain in the lower back and knees, abdominal discomfort caused by cold, uterine coldness and painful menstruation, among others.10 I've described ginger, cinnamon and clove as very warming oils: blend them with some coconut oil, rub them on your skin, and they make a great natural topical pain reliever.16 For cinnamon, keep that blend at the low dilution in the how-to section below.
What is cinnamon oil good for?
Cinnamon oil's human research centers on the mouth and the skin: in randomized trials, a cinnamon-oil rinse and spray cut Candida in people with oral thrush, and a massage blend that included it shortened period pain.56 In another randomized trial, cinnamaldehyde, bark oil's main compound, healed canker sores faster than placebo, and in lab tests the oil stops yeast and bacteria, including as a vapor.1734
Four clinical studies on this page tested cinnamon oil alone or in a blend, three of them randomized trials, and three more trials tested cinnamaldehyde, bark oil's main compound, in people.561819172021 The lab research against yeast and bacteria is broad.
| Use | Evidence | What was studied | What the research shows |
|---|---|---|---|
Oral thrush | Emerging | Cinnamon-oil mouthwash and spray, 15 days | Candida down 61% on the mouth lining; thrush improved with cinnamon and with nystatin5 |
Period pain | Emerging | Abdominal massage with a 5% blend of cinnamon, clove, rose and lavender oils | 18.6 hours of pain, against 23.1 with almond oil alone6 |
Canker sores | Emerging | Cinnamaldehyde patches, 7 days | Sores 0.04 mm across by day 7, against 1.5 mm on placebo17 |
Denture cleaning | Emerging | Cinnamaldehyde soak, 7 days | Cut bacteria and yeast about as much as a dilute bleach soak20 |
Intestinal yeast | Emerging | Capsule of cinnamon and patchouli oils | 43 of 60 cleared the infection by the study's measure, the other 17 improved18 |
Bacteria and yeast | Preclinical | Cinnamon bark and cassia oils, liquid and vapor | Stopped airway bacteria as a vapor; stopped Candida growth43 |
How cinnamon oil works in your body
Most of what's known about how cinnamon oil works on yeast comes from lab studies, with a human trial at the end of the chain:
Cinnamon bark oil averages 69.0% cinnamaldehyde; leaf oil is mostly eugenol instead.1
In lab tests, cinnamon oil stopped Candida albicans at 64 micrograms per mL, and cassia oil, from a related tree, at 65 micrograms per mL.183
Under the microscope, with cinnamon and patchouli oils combined, hollows appeared on Candida cells within 24 to 48 hours, and by 48 to 72 hours the cell walls were damaged and the cells had emptied out.18
On denture plastic, cassia oil cut the living yeast in mature biofilms right after treatment.3
In a randomized trial in people with oral thrush, a cinnamon-oil rinse and spray lowered Candida on the mouth lining.5
Against bacteria, a 2024 review of the lab research describes three main actions: cinnamon oil damages the cell membrane, blocks ATPase, an enzyme bacteria need for energy, and keeps biofilms from forming.1022 In the denture-plastic test, the yeast films had grown back 48 hours after a single treatment, which is why those researchers see cinnamon oil as a candidate for daily denture cleaning.3
Its warmth on your skin has a mechanism too. In 10 volunteers, a 10% cinnamaldehyde solution on the forearm switched on TRPA1, a nerve sensor that responds to irritants, causing burning pain, extra sensitivity to heat and touch, and a nerve-driven redness around the spot.23 That same sensor is the likely source of the warmth you feel from a cinnamon rub, and it's why the oil is diluted so far before it touches your skin.
Cinnamon oil benefits, ranked by evidence
Ranked by evidence, cinnamon oil does the most for yeast in the mouth and for period pain, with encouraging results from bark oil's main compound for canker sores and dentures.
Clearing yeast in the mouth
Emerging evidenceHuman studyRandomized trial · 36 people with oral thrushA cinnamon-oil mouthwash and spray cut Candida on the mouth lining by 61% in 15 days, and thrush improved both in the cinnamon group and in the group using the antifungal nystatin.5 The details and a chart are in the yeast section below.
Study takeaway: a cinnamon-oil rinse cut yeast in the mouth and eased thrush in 15 days.
Shorter, milder period pain, in a massage blend
Emerging evidenceHuman studyRandomized trial · 95 students · each tried bothStudents massaged with a 5% blend of cinnamon, clove, rose and lavender oils had 18.6 hours of period pain, against 23.1 hours with the same massage using plain almond oil, and lower pain scores on each of the first 3 days.6 The full trial and a chart are in the cramps section below.
Study takeaway: a warming oil blend massaged on the belly shortened period pain.
Faster-healing canker sores, from cinnamaldehyde
Emerging evidenceHuman studyRandomized, placebo-controlled trial · 44 adultsPatches of cinnamaldehyde, bark oil's main compound, shrank canker sores to 0.04 mm across in 7 days, while sores on placebo patches still measured 1.5 mm.17 The trial is in the yeast and mouth section below.
Study takeaway: canker sores healed faster and stopped hurting within a week.
Cleaner dentures, from cinnamaldehyde
Emerging evidenceHuman studyRandomized trial · 33 denture wearers · each tried bothA cinnamaldehyde soak, 20 minutes a day for 7 days, cut bacteria and yeast on denture material about as much as a dilute bleach soak.20
Study takeaway: a cinnamaldehyde soak cleaned dentures like dilute bleach.
Intestinal yeast, in a cinnamon and patchouli capsule
Emerging evidenceHuman studyNo comparison group · 60 patientsIn 60 patients with intestinal Candida, a capsule of cinnamon and patchouli oils left 43 clear of the infection by the study's measure and the other 17 improved.18 The study is in the yeast section below.
Study takeaway: every patient on the cinnamon and patchouli capsule got better by the study's measure.
Fighting bacteria, including as a vapor
PreclinicalIn vitro (lab)Lab studiesIn lab tests, cinnamon bark oil was the strongest overall of seven essential oils as a vapor against six bacteria that infect the airways, and it cleared some of the widest zones against drug-resistant bacteria taken from patients.413 The vapor findings are in the diffuser section below.
Study takeaway: broad action against bacteria, in liquid and in the air.
A warming herb in Chinese medicine
Traditional useTraditional useTraditional useChinese medicine uses cinnamon for complaints that come with cold, including cold-induced pain in the lower back and knees and painful menstruation.10
Study takeaway: a long-standing warming remedy for cold-related pain.
Does cinnamon oil help yeast, thrush and mouth sores?
Yes, in prepared mouth products: in a randomized trial of 36 people with oral thrush, a Ceylon cinnamon-oil mouthwash and spray cut Candida on the mouth lining by 61% in 15 days, and thrush improved in both the cinnamon group and the nystatin group.5 In a randomized, placebo-controlled trial of 44 adults, cinnamaldehyde, bark oil's main compound, also healed canker sores faster than placebo patches.17
The key human trial comes from Brazil. Thirty-six people with oral thrush were randomly assigned to a mouthwash and spray made with Ceylon cinnamon oil at 0.5 mg per mL (about 0.05%) or to nystatin, a standard antifungal, for 15 days, 18 in each group. Trained examiners saw signs and symptoms improve in both groups. In the cinnamon group, Candida counts fell 61% on the mouth lining and 33% on dentures, and one species, Candida tropicalis, disappeared from both sites. People said the cinnamon products tasted pleasant, and they had few complaints.5
61% less Candida on the mouth lining
Those products held a measured, very small amount of oil, so don't make your own cinnamon-oil mouthwash; the reasons are in who should be careful.
The same research group has tested cinnamaldehyde, bark oil's main compound, in the mouth. In a safety trial with no placebo group, 35 adults with healthy mouths applied a cinnamaldehyde ointment at one of three strengths for 15 days: exams showed no inflammation, Candida counts fell by at least 99%, and 17% felt slight burning when they put it on.21 In a randomized trial of 33 people with full dentures, a cinnamaldehyde soak, 20 minutes a day for 7 days, cut bacteria and Candida on the denture material, with results similar to a dilute bleach (sodium hypochlorite) soak; each person tried both, a week apart.20
For canker sores, a team in Iran tested cinnamaldehyde in medicated patches. In a randomized trial of 44 adults with recurring canker sores, neither the people nor the researchers knew who got what: 22 placed 10 mg cinnamaldehyde patches on their sores three times a day for 7 days, and 22 used placebo patches. Sores that started at about 4.4 mm on cinnamaldehyde and 4.5 mm on placebo measured 2.27, 0.59 and 0.04 mm by days 3, 5 and 7 on cinnamaldehyde, against 4.8, 2.81 and 1.5 mm on placebo, and pain after meals was gone by day 6, while the placebo group still rated it 1.21 on day 7. No side effects were seen in either group.17
For yeast in the gut, the study I've cited in my books comes from a hospital in China.2425 Sixty patients with intestinal Candida took a capsule containing cinnamon oil together with patchouli oil, with no comparison group. By the study's measure, 43 of the 60 (about 72%) cleared the infection and the other 17 improved.18
For gut yeast, start with food. In my Candida Cleanse Protocol, cinnamon goes on the plate: Ceylon cinnamon is on the kill phase's eat-freely list, and cinnamon added to meals is one of the food-level antifungals that stack with the herbs.26 The candida diet is the place to start, and candida die-off explains what to expect as the yeast clears. For daily mouth care, see how to get rid of bad breath and oil pulling.
Can cinnamon oil ease period cramps and sore muscles?
It can help as part of a massage blend: in a randomized trial of 95 nursing students, those who got abdominal massage with a 5% blend of cinnamon, clove, rose and lavender oils had 18.6 hours of period pain, against 23.1 hours for those massaged with almond oil alone.6
The trial ran at a nursing school in Egypt. Students with painful periods got a 10-minute abdominal massage once a day for 7 days before their period, with either the four-oil blend in sweet almond oil (cinnamon made up about 1.5% of the finished blend) or plain almond oil; each person tried both, one cycle apart, and the researcher who collected the data didn't know which oil was used. In the first cycle, pain on a 0-to-10 scale was lower with the blend on each of the first 3 days: 5.8 against 6.8, 4.3 against 5.4, and 2.7 against 3.8. Pain lasted 18.6 hours in total with the blend and 23.1 hours with almond oil. Among the 33 students whose bleeding was heavy, more moved down to average bleeding with the blend, and no side effects were reported.6
Hours of period pain: 18.6 with the cinnamon blend, 23.1 with almond oil
Painful menstruation is one of the cold-related complaints Chinese medicine has long treated with cinnamon, and this trial measured exactly that.10 The effect belongs to the blend, since cinnamon was one of four oils. For more natural steps, see how to get rid of period cramps and aromatherapy massage.
The trial's blend was given by a trained researcher for one week. For a warming rub at home, on your belly or on tight muscles, mix it at the lower dilution in the how-to section. A homemade muscle rub gives you a base to work from.
Can you use cinnamon oil in a diffuser?
Yes: add 1 to 2 drops to a water diffuser in a well-ventilated room, run it for short sessions, and turn it off if anyone's eyes, nose or throat start to sting or anyone starts coughing. In lab tests of the oil as a vapor, cinnamon bark oil was the strongest overall of seven essential oils against airway bacteria.4
Keep the scent light and the room well aired, because cinnamon oil irritates the eyes as well as the skin and may sensitize the airways too.1
The lab work on cinnamon vapor is encouraging. Researchers in Hungary tested seven essential oils against six bacteria that infect the airways, including Streptococcus pneumoniae and Haemophilus influenzae, and measured them two ways: mixed into liquid and as a vapor in a closed space. As a vapor, cinnamon bark oil stopped all six bacteria at 15.62 to 90 microliters per liter of air, the smallest amounts of any of the seven oils against four of them and tied for smallest against a fifth, and in liquid it was the most effective against Haemophilus.4 In a randomized trial of 60 women having a cesarean delivery, breathing in cinnamon leaf oil during surgery didn't change nausea afterward compared with saline.19 For cold season, I've named lemon oil along with warming oils like ginger and cinnamon as good additions to a blend.16
To make a warm blend, pair the cinnamon with a citrus oil such as orange or lemon. In Ancient Remedies I wrote, "If you experience any side effects, like dizziness or nausea, when using an oil, stop using it immediately."24 For more options, see essential oils for colds and antibacterial essential oils.
Does cinnamon oil help blood sugar?
For blood sugar, use cinnamon the spice: in a 2023 review that pooled 11 meta-analyses of randomized trials, cinnamon supplementation lowered fasting blood sugar by about 11 mg/dL in people with type 2 diabetes or PCOS, and it also lowered fasting insulin, insulin resistance, and HbA1c by 0.10 percentage points.27
Blood sugar is cinnamon's best-known benefit, and the research behind it is about the spice. As I've said on my show, "There is a meta-analysis of 16 studies, and they found that cinnamon significantly reduced fasting blood sugar levels and helped fight prediabetes, diabetes, and insulin resistance."28 A 2019 analysis that pooled 16 randomized trials in people with type 2 diabetes or prediabetes found that fasting blood sugar fell by about 10 mg/dL and insulin resistance improved compared with placebo, while HbA1c and cholesterol didn't change significantly.29
For blood sugar, I like to add cinnamon to my diet as a powder rather than a supplement.9 My Insulin Resistance & Prediabetes protocol uses 1 gram of Ceylon cinnamon a day,30 and my Type 2 Diabetes Protocol specifies Ceylon, the low-coumarin kind, over cassia.31 Stir it into oatmeal, coffee or a smoothie, or brew cinnamon tea. If you take medication to lower your blood sugar and add cinnamon, have your doctor adjust your dose as your numbers improve. More on the spice is in Ceylon cinnamon benefits, cinnamon pills and the diabetic diet plan.
Three markers that show how your body handles sugar
These three markers show where your blood sugar stands. Targets are Dr. Axe's functional ranges.
- Fasting glucose: Your blood sugar after an overnight fast. It's the measure the cinnamon analyses found lower.
- HbA1c: Your average blood sugar over about three months. Dr. Axe's target is under 5.4%.
- Fasting insulin: How hard your body works to hold blood sugar steady. Dr. Axe's target is about 2 to 6 µIU/mL.
See the cellular bloodwork panel
Have results? Analyze them free → →How to use cinnamon oil
On your skin, mix no more than 1 drop of cinnamon oil into a tablespoon of carrier oil, about a 0.3% blend, and test it on a small patch of skin on the inside of your forearm for a day first.78 In a diffuser, use 1 to 2 drops. By mouth, stir about 1 drop of a food-grade cinnamon bark oil into a spoonful of honey or a smoothie, for up to two weeks.25113233
Cinnamon is a hot oil, so it gets far more carrier than gentler oils do. People already allergic to cinnamaldehyde react to very small amounts of it, as the safety section explains,8 and an aromatherapy safety institute, after surveying cinnamon oil users, recommends keeping cinnamon bark oil at 0.1% to 1% on the skin.7 One drop is about 0.05 mL and a tablespoon is 15 mL, so 1 drop per tablespoon works out to roughly 0.3%, inside that range. Use the same dilution for leaf oil.1 Essential oil safety covers storage and dilution for other oils too.
Cinnamon oil can go by mouth, too. In The Biblio Diet, Jordan Rubin and I list cinnamon essential oil among the ways to get cinnamon's benefits, beside Ceylon cinnamon powder and cinnamon tablets or capsules, and we warn never to swallow an essential oil without diluting it in water or another suitable drink.25 On my show, I've said you can mix 1 to 2 drops of cinnamon bark oil into food for up to two weeks, or add 1 to 2 drops of cinnamon oil to a smoothie.1132 Start at about 1 drop, the low end of that range, in a smoothie or a spoonful of honey, which is how I like to take oils as a supplement.33 Choose a food-grade bark oil labeled for supplement use, and keep it to two weeks or less.11 Who should skip it, and the medicines to watch, are in the safety section.
A few guidelines keep it comfortable:
- Always use a carrier. Coconut oil, MCT oil, jojoba or almond oil all work, and you mix the cinnamon in before it touches your skin.2
- Mind the sensitive spots. Keep it away from your eyes, ears, lips, mucous membranes and any broken or irritated skin, and wash your hands after applying it.25
Ask Dr. Axe AI. Answers are grounded in this library, with sources shown.
How to choose a cinnamon oil
Look for these on the label and from the seller:
The species on the label, Cinnamomum verum or Cinnamomum zeylanicum for Ceylon cinnamon; oil from Cinnamomum cassia is sold as cassia oil110
Bark or leaf named, since the two oils are mostly different compounds1
One ingredient, 100% pure, organic when you can find it, with nothing added
A batch test report from the seller showing what's in the oil
Amber glass with a child-resistant cap, stored somewhere cool and out of children's reach34
Cinnamon oil side effects & who should be careful
Cinnamon oil's main risk is a skin reaction: both bark oil and leaf oil irritate the skin and eyes and can cause skin allergy, so it always goes into a carrier oil at a low dilution.1 Skip it on your skin in pregnancy, with a fragrance or cinnamon allergy, and on children; by mouth, it's for adults only, never in pregnancy.
A European food-safety panel that reviewed both oils concluded that cinnamon bark oil and cinnamon leaf oil irritate the skin and eyes and can sensitize the skin, and it couldn't rule out that they sensitize the airways too.1 Sensitization means your immune system learns to react, so a reaction can show up after earlier uses that went fine.
How common are reactions? In an online survey of 290 people who had used cinnamon bark or cassia oil on their skin, 77 (27%) reported a reaction: 34% of those who used it undiluted and 24% of those who diluted it, with redness the most common sign; the people answering chose to take part, which likely pushes the figure up.7 Once you're allergic, very small amounts can set it off: in 18 people allergic to cinnamaldehyde, patch tests set off reactions at concentrations as low as 0.02%, and 13 of the 18 developed eczema in a 6-week use test on the upper arm, at concentrations from 0.1% up.8
Fragrance allergies tend to travel together. Among 24,246 people patch-tested for suspected skin allergies in North America, 22.7% reacted to a fragrance or botanical ingredient, allergy to cinnamic aldehyde (cinnamaldehyde) was trending up, and people who reacted to one fragrance often reacted to others, including balsam of Peru.36 See fragrance sensitivity and contact dermatitis if that sounds like you.
Undiluted oil can burn. In one reported case, a 68-year-old who sat for about 2 hours on a cushion soaked with spilled, undiluted cinnamon oil got a chemical burn over 8% of the body.37 The mouth reacts too. In a review of 74 cases of sores on the inner cheeks and tongue traced to cinnamon-flavored chewing gum or candy, every case cleared within a week of stopping.38 And over 5 months, a poison center logged 32 boys aged 11 to 16 who had sucked on toothpicks or fingers dipped in cinnamon oil: they had flushing and a burning mouth, some had nausea or stomach pain, and no body-wide effects were reported; 8 had skin irritation from redness to welts, and 2 had mild eye irritation that cleared with rinsing.34
Pregnancy: I list cinnamon among the oils that can affect hormones during pregnancy, so skip it on your skin and by mouth while you're pregnant; diffusing a little of it isn't likely to affect your body in a negative way.2
Children: don't use it on children's skin or give it to them by mouth, and keep the bottle out of their reach. If a child swallows it, call Poison Control at 1-800-222-1222.34
By mouth: adults only, for no more than two weeks at a time, and skip it with liver problems, inflammatory bowel disease, major leaky gut or a sensitive gut.11 Stop at any mouth or stomach irritation, dizziness or nausea.3424
Allergy: skip it if you've reacted to cinnamon, cinnamon-flavored products, fragrance or balsam of Peru.3638
Skin: never undiluted, never on broken skin, and wash it off with soap and water at any burning, redness or rash.3734
Eyes and mouth: rinse an eye exposure with plenty of water, keep the oil off your lips, and never put it in your mouth undiluted.3438
See a doctor promptly for a burn that blisters or eye pain that doesn't ease after rinsing, and call 911 for swelling of the face or lips or trouble breathing after using it.
The bottom line
Should you use cinnamon oil?
Yes, as the hot, warming oil it is. Chinese and Ayurvedic healers have used cinnamon bark for centuries for cold-related pain, the mouth and the teeth, and I respect that history. In a randomized trial, a cinnamon-oil rinse cut yeast in people with oral thrush, and in another, a massage blend that included it shortened period pain. The mouth and massage findings are the best studied. The canker sore and denture results from bark oil's main compound, each from a randomized trial, are promising, and the lab research against yeast and bacteria is broad.
Mix no more than 1 drop into a tablespoon of carrier oil for your skin, after a patch test, and use 1 to 2 drops in a diffuser. To take it by mouth, stir about 1 drop of a food-grade bark oil into honey or a smoothie, for two weeks at most. Skip it on your skin in pregnancy, with a fragrance allergy and on children, and never use it undiluted. For blood sugar, reach for ground Ceylon cinnamon. Your body was designed to heal, and this ancient, warming bark, used with care, gives it real support.
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Open the free protocol → →Cinnamon oil: frequently asked questions
What is cinnamon oil good for?
Cinnamon oil is best studied for yeast in the mouth and for period pain: in a randomized trial of 36 people with oral thrush, a cinnamon-oil mouthwash and spray cut Candida on the mouth lining by 61% in 15 days, and in a randomized trial in which 95 students each tried both, those massaged with a blend that included it had 18.6 hours of period pain in the first cycle, against 23.1 with almond oil alone.56 It's also a warming oil for massage and a diffuser, and in lab tests it stops yeast and bacteria.104
What's the difference between cinnamon bark oil and cinnamon leaf oil?
Is cinnamon oil the same as cassia oil?
No: cinnamon oil comes from true cinnamon, Cinnamomum verum, and cassia oil comes from Cinnamomum cassia, also called Chinese cinnamon.110 Cassia oil has its own page: cassia oil.
How do you dilute cinnamon oil for your skin?
Can you put cinnamon oil directly on your skin?
Does cinnamon oil help with yeast or thrush?
Yes, in prepared mouth products: in a randomized trial of 36 people with oral thrush, a cinnamon-oil mouthwash and spray cut Candida on the mouth lining by 61% in 15 days, and thrush improved in both the cinnamon and nystatin groups.5 For gut yeast, Dr. Axe's Candida Cleanse Protocol puts Ceylon cinnamon on the plate.26
Can you use cinnamon oil for blood sugar?
For blood sugar, use cinnamon the spice: in a 2023 review that pooled 11 meta-analyses of randomized trials, cinnamon supplementation lowered fasting blood sugar by about 11 mg/dL in people with type 2 diabetes or PCOS, and lowered insulin resistance and HbA1c too.27 Dr. Axe adds cinnamon to his diet as a powder, and his insulin resistance protocol uses 1 gram of Ceylon cinnamon a day.930
Can you use cinnamon oil in candy or baking?
Yes, as a flavoring: the FDA lists cinnamon bark and leaf oils as generally recognized as safe for their intended use as food flavorings.12 Some people react to cinnamon flavoring, though: in a review of 74 cases of mouth sores traced to cinnamon-flavored gum or candy, every case cleared within a week of stopping.38
Can you take cinnamon oil internally?
Yes, in small amounts for a short time: stir about 1 drop of a food-grade cinnamon bark oil into a spoonful of honey or a smoothie, and keep it to two weeks or less.25113233 It's for adults only: skip it in pregnancy and with liver problems, inflammatory bowel disease or a sensitive gut, and see the safety section if you take blood sugar medication or a blood thinner.211
Are cinnamon oil toothpicks safe?
No: sucking on toothpicks or fingers dipped in cinnamon oil caused a burning mouth and facial flushing in 32 boys aged 11 to 16 reported to one poison center, and some had nausea or stomach pain.34 Keep the bottle out of children's reach.
Is cinnamon oil good for hair growth?
There's no study yet showing that cinnamon oil grows hair. If you add it to a scalp oil, use the same skin dilution, no more than 1 drop per tablespoon of carrier oil, after a patch test, and see essential oils for hair for more options.
Can you put cinnamon oil on your lips?
Is cinnamon oil safe during pregnancy?
Skip it on your skin and by mouth while you're pregnant: Dr. Axe lists cinnamon among the oils that can affect hormones during pregnancy, though diffusing a little of it isn't likely to affect the body in a negative way.2
Is cinnamon oil safe for kids?
Don't use it on children's skin or give it to them by mouth, and keep the bottle out of their reach; if a child swallows it, call Poison Control at 1-800-222-1222.34
What are the side effects of cinnamon oil?
The main side effects are skin irritation and skin allergy: in an online survey of 290 people who had used cinnamon bark or cassia oil on their skin and chose to take part, 27% reported a reaction, more often when they used it undiluted.71 Undiluted oil can burn the skin, and cinnamon flavoring can cause mouth sores in sensitive people.3738
Why does cinnamon oil feel hot on your skin?
Bark oil's main compound, cinnamaldehyde, switches on TRPA1, a nerve sensor for irritants: in a study of 10 volunteers, a 10% cinnamaldehyde solution on the forearm caused burning, heat sensitivity and redness.23 That's why the oil is always diluted before it touches your skin.
Freshness & update log
October 9, 2026 — Trimmed repeated book references.
October 5, 2026 — Rewrote the page in full and corrected Dr. Axe's credentials in the byline to DC, DNM, CNS. The previous version advised mixing cinnamon oil 1:1 with coconut oil for the skin and two drops in a tablespoon of coconut oil as a lip plumper, credited the oil with heart, blood sugar, cholesterol, weight-loss, libido, ulcer and parasite benefits drawn from studies of cinnamon spice, extracts, animals or cells, and cited a diabetes trial that now carries a journal expression of concern. This version explains bark oil and leaf oil, ranks the oil's benefits by human evidence with each study's design and size, adds a Dr. Axe Score (5.5) with an interaction check, three charts and a step diagram, a low skin dilution and diffuser amounts, Dr. Axe's guidance for taking a drop by mouth, a pointer to cinnamon the spice for blood sugar, and cautions for skin allergy, burns, the mouth, pregnancy and children, with 38 references.
August 28, 2024 — Previous version last updated.
References
- EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), Bampidis V, Azimonti G, Bastos ML, Christensen H, Fašmon Durjava M, et al. Safety and efficacy of feed additives consisting of essential oils from the bark and the leaves of Cinnamomum verum J. Presl (cinnamon bark oil and cinnamon leaf oil) for use in all animal species (FEFANA asbl). EFSA J. 2022;20(10):e07601. doi:10.2903/j.efsa.2022.7601
- Axe J. Dangers of Essential Oils: Top 10 Essential Oil Mistakes to Avoid | Dr. Josh Axe. The Dr. Josh Axe Show. 2017 (Dr. Axe speaking; dilution at 5:01-5:24 and pregnancy at 8:15-8:46 on YouTube: https://www.youtube.com/watch?v=1vuLggcLDLg).
- Almeida Lde F, Paula JF, Almeida RV, Williams DW, Hebling J, Cavalcanti YW. Efficacy of citronella and cinnamon essential oils on Candida albicans biofilms. Acta Odontol Scand. 2016;74(5):393-8. doi:10.3109/00016357.2016.1166261
- Ács K, Balázs VL, Kocsis B, Bencsik T, Böszörményi A, Horváth G. Antibacterial activity evaluation of selected essential oils in liquid and vapor phase on respiratory tract pathogens. BMC Complement Altern Med. 2018;18(1):227. doi:10.1186/s12906-018-2291-9
- de Araújo MRC, Maciel PP, Castellano LRC, Bonan PRF, Alves DDN, de Medeiros ACD, et al. Efficacy of essential oil of cinnamon for the treatment of oral candidiasis: A randomized trial. Spec Care Dentist. 2021;41(3):349-357. doi:10.1111/scd.12570
- Marzouk TM, El-Nemer AM, Baraka HN. The effect of aromatherapy abdominal massage on alleviating menstrual pain in nursing students: a prospective randomized cross-over study. Evid Based Complement Alternat Med. 2013;2013:742421. doi:10.1155/2013/742421
- Tisserand Institute. Cinnamon Survey: Special Report (adverse skin reactions to cinnamon bark and cassia essential oils; online survey, May-July 2015, 345 responses, 290 analyzed). Tisserand Institute; 2015.
- Johansen JD, Andersen KE, Rastogi SC, Menne T. Threshold responses in cinnamic-aldehyde-sensitive subjects: results and methodological aspects. Contact Dermatitis. 1996;34(3):165-71. doi:10.1111/j.1600-0536.1996.tb02167.x
- Axe J. How to Reverse Insulin Resistance Naturally in 30 Days. The Dr. Josh Axe Show. 2025 (Dr. Axe speaking; Ceylon cinnamon at 33:33-34:04 on YouTube: https://www.youtube.com/watch?v=CisGqhRrErY).
- Guo J, Jiang X, Tian Y, Yan S, Liu J, Xie J, et al. Therapeutic Potential of Cinnamon Oil: Chemical Composition, Pharmacological Actions, and Applications. Pharmaceuticals (Basel). 2024;17(12):1700. doi:10.3390/ph17121700
- Axe J. Parasite Cleanse: The Best Essential Oils. The Dr. Josh Axe Show. 2017 (Dr. Axe speaking; cinnamon bark at 2:19-3:24 and 9:06-9:18 on YouTube: https://www.youtube.com/watch?v=DDYTUnzP97Q).
- U.S. Food and Drug Administration. 21 CFR 182.20: Essential oils, oleoresins (solvent-free), and natural extractives (including distillates) generally recognized as safe (cinnamon bark and cinnamon leaf, Ceylon, Chinese and Saigon). Electronic Code of Federal Regulations; current as of 2026.
- Patterson JE, McElmeel L, Wiederhold NP. In Vitro Activity of Essential Oils Against Gram-Positive and Gram-Negative Clinical Isolates, Including Carbapenem-Resistant Enterobacteriaceae. Open Forum Infect Dis. 2019;6(12):ofz502. doi:10.1093/ofid/ofz502
- Rao PV, Gan SH. Cinnamon: a multifaceted medicinal plant. Evid Based Complement Alternat Med. 2014;2014:642942. doi:10.1155/2014/642942
- Axe J. 8 Surprising Essential Oil Remedies. The Dr. Josh Axe Show. 2017 (Dr. Axe speaking; holy anointing oil at 15:37-16:02 on YouTube: https://www.youtube.com/watch?v=oWEEKIaHbeQ).
- Axe J, Rubin J. Essential Oils As Medicine: Essential Oils Guide. The Dr. Josh Axe Show. 2017 (Dr. Axe speaking at 18:19-18:49 and 26:39-26:57; the 11:47-12:47 cinnamon passage is Jordan Rubin's; YouTube: https://www.youtube.com/watch?v=iMvWIAZ21KU).
- Molania T, Malekzadeh Shafaroudi A, Saeedi M, Moosazadeh M, Valipour F, Rostamkalaei SS, et al. Evaluation of cinnamaldehyde mucoadhesive patches on minor recurrent aphthous stomatitis: a randomized, double-blind, placebo-controlled clinical trial. BMC Oral Health. 2022;22(1):235. doi:10.1186/s12903-022-02248-5
- Wang GS, Deng JH, Ma YH, Shi M, Li B. Mechanisms, clinically curative effects, and antifungal activities of cinnamon oil and pogostemon oil complex against three species of Candida. J Tradit Chin Med. 2012;32(1):19-24. doi:10.1016/s0254-6272(12)60026-0
- Sadeghi N, Nasimi F, Zeidabadinejad S, Kargar Jahromi H, Firouzabadi M. The Effect of Combination of Cinnamon and Oxygen Different Concentrations Inhalation Aromatherapy on, Nausea, Assessment in Cesarean Section Under Spinal Anesthesia: A Clinical Trial. J Perianesth Nurs. 2026;41(5):1220-1225.e1. doi:10.1016/j.jopan.2026.05.007
- de Almeida MAL, Batista AUD, de Araújo MRC, de Almeida VFDS, Bonan PRF, Nóbrega Alves D, et al. Cinnamaldehyde is a biologically active compound for the disinfection of removable denture: blinded randomized crossover clinical study. BMC Oral Health. 2020;20(1):223. doi:10.1186/s12903-020-01212-5
- da Nóbrega Alves D, Melo AKV, Alves AF, de Araújo MRC, da Silva Araújo R, de Castro RD. Safety and tolerability of cinnamaldehyde in orabase for oral candidiasis treatment: phase I clinical trial. Clin Oral Investig. 2022;26(7):4825-4833. doi:10.1007/s00784-022-04450-9
- Doyle AA, Stephens JC. A review of cinnamaldehyde and its derivatives as antibacterial agents. Fitoterapia. 2019;139:104405. doi:10.1016/j.fitote.2019.104405
- Namer B, Seifert F, Handwerker HO, Maihöfner C. TRPA1 and TRPM8 activation in humans: effects of cinnamaldehyde and menthol. Neuroreport. 2005;16(9):955-9. doi:10.1097/00001756-200506210-00015
- Axe J. Ancient Remedies: Secrets to Healing with Herbs, Essential Oils, CBD, and the Most Powerful Natural Medicine in History. Little, Brown Spark (Hachette Book Group); 2021 (cinnamon entry: Candida line with its note 35; "Precautions" lines for essential oils, p. 147).
- Rubin J, Axe J. The Biblio Diet. Apiary (Hachette Book Group); 2025 (spices section, cinnamon entry and its note 45, which cites Wang 2012; "Take Action Now" essential-oil cautions).
- Axe J. The Candida Cleanse Protocol: The 30-Day Healing Protocol. DrAxe.com. 2026 (Kill phase "Eat Freely" list and Top 8 honorable mentions: Ceylon cinnamon; reference 21, cinnamon essential oil on Candida biofilms).
- Zarezadeh M, Musazadeh V, Foroumandi E, Keramati M, Ostadrahimi A, Mekary RA. The effect of cinnamon supplementation on glycemic control in patients with type 2 diabetes or with polycystic ovary syndrome: an umbrella meta-analysis on interventional meta-analyses. Diabetol Metab Syndr. 2023;15(1):127. doi:10.1186/s13098-023-01057-2
- Axe J. Top 5 Holiday Superfoods You Didn't Know You Needed. The Dr. Josh Axe Show. 2024 (Dr. Axe speaking; cinnamon at 5:45-7:28 on YouTube: https://www.youtube.com/watch?v=ppj8vUGgLNI).
- Deyno S, Eneyew K, Seyfe S, Tuyiringire N, Peter EL, Muluye RA, et al. Efficacy and safety of cinnamon in type 2 diabetes mellitus and pre-diabetes patients: A meta-analysis and meta-regression. Diabetes Res Clin Pract. 2019;156:107815. doi:10.1016/j.diabres.2019.107815
- Axe J. Insulin Resistance & Prediabetes. DrAxe.com. 2026 (Top 8 blood sugar supports: Ceylon cinnamon 1 g daily, #5; supplements table).
- Axe J. The Type 2 Diabetes Protocol. DrAxe.com. 2026 (tiered supplement protocol: Ceylon cinnamon 1-2 g with meals, "Use Ceylon (low-coumarin), not cassia").
- Axe J. How to Lower Cholesterol Naturally in 4 Steps | Dr. Josh Axe. The Dr. Josh Axe Show. 2017 (Dr. Axe speaking; "about 1 to 2 drops of a cinnamon oil ... add that to a smoothie," in the essential oils and supplements segment).
- Axe J. 10 Keys to Conquer Crohn's & Colitis. The Dr. Josh Axe Show. 2017 (Dr. Axe speaking; how he takes essential oils as a supplement, drops on a spoon with honey).
- Perry PA, Dean BS, Krenzelok EP. Cinnamon oil abuse by adolescents. Vet Hum Toxicol. 1990;32(2):162-4.
- Huang J, Wang S, Luo X, Xie Y, Shi X. Cinnamaldehyde reduction of platelet aggregation and thrombosis in rodents. Thromb Res. 2007;119(3):337-42. doi:10.1016/j.thromres.2006.03.001
- Atwater AR, Ward JM, Liu B, Green CL, Belsito DV, Sasseville D, et al. Fragrance- and Botanical-Related Allergy and Associated Concomitant Reactions: A Retrospective Analysis of the North American Contact Dermatitis Group Data 2007-2016. Dermatitis. 2021;32(1):42-52. doi:10.1097/DER.0000000000000661
- Connolly M, Axtell A, Hickey S, Whalen A, McNamara L, Albright D, et al. Chemical Burn From Cinnamon Oil. Eplasty. 2017;17:ic11.
- Kalogirou EM, Aktypi-Bampouranou A, Vasilaki M, Chatzidimitriou K, Tosios KI. Cinnamon-Induced Contact Stomatitis: A Retrospective Study of 74 Cases and Literature Review. Oral Dis. 2026;32(2):471-479. doi:10.1111/odi.70081
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