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Quick answer: “cinnamon essential oil” can mean three different oils. Cinnamon bark oil, from Ceylon cinnamon (Cinnamomum verum), is rich in cinnamaldehyde and is one of the strongest skin sensitizers among common essential oils. Cinnamon leaf oil, from the same tree, is mostly eugenol and is somewhat less risky but still irritating. Cassia oil, from Cinnamomum cassia, is also high in cinnamaldehyde. Essential Oil Safety by Tisserand and Young sets very low maximum skin concentrations: about 0.07 percent for bark oil, 0.05 percent for cassia and 0.6 percent for leaf oil. Cinnamon oils are best used sparingly in a diffuser, kept away from cats and children, and never applied undiluted.
Cinnamon’s warm, sweet scent is one of the most recognizable in the world, and cinnamon oil shows up in holiday diffuser blends, candles, cleaning recipes and DIY “immune” mixes. It is also one of the oils most likely to cause trouble on skin. Knowing which cinnamon oil you have and how strong it is makes the difference between a pleasant room scent and a painful rash.
This guide explains the three main cinnamon oils, what they contain, how people use them and the safety limits that matter. For the basics of dilution, carrier oils and safe methods, start with our essential oils guide.
Sources: Robert Tisserand and Rodney Young, Essential Oil Safety, 2nd edition (2014); National Center for Complementary and Integrative Health (NCCIH), “Aromatherapy” fact sheet; U.S. Food and Drug Administration, 21 CFR 182.20 (essential oils generally recognized as safe as flavorings); European Union Cosmetics Regulation (EC) No 1223/2009, Annex III fragrance allergen labeling; German Federal Institute for Risk Assessment (BfR) opinions on coumarin in cassia cinnamon; ASPCA Animal Poison Control Center; Herodotus, Histories, Book 3; Exodus 30. Not medical advice. Checked October 2026.
Three Oils Sold as "Cinnamon"
Several trees in the genus Cinnamomum produce the spice we call cinnamon. Two species dominate the essential oil trade.
- Ceylon cinnamon, Cinnamomum verum (also listed as Cinnamomum zeylanicum), is native to Sri Lanka. Its inner bark is the delicate, many-layered “true cinnamon” quill. Both bark oil and leaf oil are distilled from this tree.
- Cassia, Cinnamomum cassia, also called Chinese cinnamon, is grown mainly in southern China and Southeast Asia. Its thicker bark is the most common cinnamon spice in North American supermarkets. Cassia oil is usually distilled from leaves, twigs and bark.
| Oil | Species | Plant part | Main constituent (typical) | Tisserand and Young max skin use |
|---|---|---|---|---|
| Cinnamon bark | Cinnamomum verum | Inner bark | Cinnamaldehyde (often around 60-75%) | 0.07% |
| Cinnamon leaf | Cinnamomum verum | Leaves | Eugenol (often around 70-80%+) | 0.6% |
| Cassia | Cinnamomum cassia | Leaves, twigs, bark | Cinnamaldehyde (often 75% or more) | 0.05% |
Constituent ranges vary by batch and source. A supplier’s GC/MS report shows the actual percentages for a given lot.
How to tell them apart on a label
Always look for the Latin name and the plant part. “Cinnamon oil” with no other detail is not enough information. Bark oil is usually the most expensive of the three; leaf oil is often the cheapest. A low-priced “cinnamon bark” oil may be cassia, leaf oil or a blend. Our guide on how to tell if essential oils are pure explains how to read test reports and spot red flags.
A Very Old Spice
Cinnamon and cassia were traded across the ancient world long before distillation. The Book of Exodus lists both “sweet cinnamon” and cassia among the ingredients of the holy anointing oil. The Greek historian Herodotus, writing in the fifth century BC, repeated a fanciful story that cinnamon sticks were gathered from the nests of large birds in Arabia. That tale says more about how carefully traders guarded their sources than about where cinnamon grew.
Sri Lanka’s cinnamon trade later shaped colonial history, with Portuguese, Dutch and British powers competing for control of the island’s supply between the sixteenth and nineteenth centuries.
What the Chemistry Means
Cinnamaldehyde
Cinnamaldehyde gives cinnamon bark and cassia their hot, sweet, unmistakable smell. It is also a well-established skin sensitizer. Sensitization means the immune system learns to react to a substance; once that happens, even small amounts can trigger an allergic rash in the future. Cinnamal, the cosmetic name for cinnamaldehyde, is one of the fragrance allergens that must be named on cosmetic labels in the European Union when it exceeds set thresholds, and it is part of the standard fragrance mix that dermatologists use in patch testing.
Because of this, Tisserand and Young set unusually low dermal maximums for bark and cassia oils: 0.07 and 0.05 percent. That is roughly one drop in 70 to 100 milliliters of carrier oil, far below the 1 to 2 percent many people use for gentler oils.
Eugenol
Eugenol dominates cinnamon leaf oil and is also the main component of clove bud oil. It smells spicier and more clove-like than bark oil. Eugenol is a skin and mucous membrane irritant at higher concentrations, and Tisserand and Young note that it can inhibit blood clotting, which is a concern for oral use with anticoagulant medication. Its dermal maximum of 0.6 percent in leaf oil is higher than bark oil’s, but still low.
Coumarin in cassia
Cassia bark, the spice, contains coumarin, a natural compound that Germany’s Federal Institute for Risk Assessment (BfR) has flagged for its potential effects on the liver when large amounts of cassia are eaten regularly. Ceylon cinnamon contains far less. Cassia essential oil can also contain coumarin. This is mostly a concern for people who consume large amounts of cassia spice or take cinnamon supplements; it is another reason not to swallow essential oils.
How People Use Cinnamon Oils
Diffusing
Diffusing is the most common and lowest-risk way to enjoy cinnamon oils. A single drop of bark or cassia oil, or one to two drops of leaf oil, mixed with other oils is enough for most rooms. Cinnamon is strong; more is not better.
Popular pairings include:
- Cinnamon leaf and sweet orange, a classic warm blend
- Cinnamon leaf, clove and orange, often marketed as a “holiday” or “thieves-style” blend
- Cinnamon bark and vanilla CO2 or absolute for a dessert-like scent
- Cinnamon leaf and cedarwood for a warm woody note
Diffuse in short intervals, in a ventilated room, and stop if anyone develops coughing, a headache or eye irritation. Cinnamon oils are considered mucous membrane irritants, so avoid placing a diffuser close to someone’s face.
Topical use
Because of the sensitization risk, many aromatherapists avoid putting cinnamon bark and cassia oils on skin at all. If you do include them, stay at or below the dermal maximums and use them only in small amounts within a larger blend. Never use cinnamon oils:
- Undiluted on skin
- In bath water, where oil floats and can concentrate on skin and mucous membranes
- On children’s skin
- On broken, irritated or sensitive skin
- In lip products, unless formulated by a professional within legal limits
If you react to a product with cinnamon oil, stop using it. Our guide to essential oil skin reactions explains how to tell irritation from allergy and when to see a doctor.
Household and cleaning uses
Cinnamon leaf oil appears in many DIY cleaning sprays for its scent. Use very small amounts, wear gloves when handling concentrated blends and keep sprays away from food surfaces unless rinsed. Test on finishes first.
Flavoring
Cinnamon and cassia oils are listed in FDA regulation 21 CFR 182.20 as generally recognized as safe for use as food flavorings at the tiny levels used by manufacturers. Commercial flavor oils are blended and dosed precisely. That listing does not make it safe to add drops of essential oil to drinks or capsules at home. Cinnamon oil can burn the mouth, throat and stomach, and swallowing it has caused poisonings in children.
What the Research Says
Cinnamon bark and cassia oils have shown antimicrobial activity in laboratory studies, which is why they appear in many DIY “immune” and cleaning recipes. Results in a test tube do not show that diffusing or applying an oil prevents or treats infection in people. The National Center for Complementary and Integrative Health notes that aromatherapy research is limited and that essential oils should not be used in place of proven medical care.
Enjoy cinnamon oils for their scent, and be skeptical of products that promise to boost immunity, balance blood sugar or kill viruses.
Safety Summary
| Concern | Bark and cassia | Leaf |
|---|---|---|
| Skin sensitization | High | Moderate |
| Skin and mucous membrane irritation | Yes | Yes |
| Maximum skin concentration (Tisserand and Young) | 0.07% bark, 0.05% cassia | 0.6% |
| Children | Avoid topical use; diffuse sparingly, if at all | Avoid topical use; diffuse sparingly |
| Pregnancy | Ask a doctor or midwife | Ask a doctor or midwife |
| Medications | Talk to a doctor, especially with diabetes medication | Eugenol may affect clotting; ask about anticoagulants |
| Pets | Keep away from cats and dogs | Keep away from cats and dogs |
Pets
The ASPCA Animal Poison Control Center lists cinnamon oil among essential oils that can harm pets. Cats are particularly sensitive. Do not apply cinnamon oils to animals, keep bottles closed and out of reach, and diffuse only where pets can leave the room. Our guide on essential oils and pets has more detail.
Getting dilution right
At these concentrations, drop counting gets tricky. One percent is roughly six drops in 30 milliliters of carrier oil, so 0.6 percent leaf oil is about three to four drops in 30 milliliters, and 0.07 percent bark oil is less than a single drop in that amount. To use bark oil on skin safely you would need to make a larger batch or pre-dilute it. Our essential oil dilution chart shows how percentages convert to drops.
Simple Seasonal Diffuser Blends
These blends assume a typical ultrasonic diffuser filled to the manufacturer’s water line. Start at the low end and adjust to your room; strong spice oils can overwhelm a small space quickly.
- Cozy kitchen: 3 drops sweet orange, 1 drop cinnamon leaf, 1 drop ginger
- Autumn evening: 2 drops cedarwood, 2 drops sweet orange, 1 drop cinnamon leaf
- Spiced citrus: 3 drops sweet orange, 1 drop clove bud, 1 drop cinnamon leaf
- Soft and sweet: 3 drops lavender, 1 drop cinnamon bark (bark is stronger, so one drop is plenty)
Run the diffuser for about 30 to 60 minutes, then turn it off and air the room. If you prefer a passive option, add a single drop of cinnamon leaf oil to a bowl of pinecones or a wooden diffuser block placed out of reach of children and pets. Passive methods release far less oil into the air than an electric diffuser, which suits strong spice oils well.
Swap cinnamon for a gentler warm note, such as sweet orange or cedarwood alone, whenever someone in the household has asthma, a fragrance allergy or sensitive skin.
Buying and Storing Cinnamon Oils
- Read the Latin name and plant part before buying.
- Expect bark oil to cost more than leaf or cassia.
- Ask for a GC/MS report, which shows cinnamaldehyde and eugenol levels.
- Buy small bottles; you will use very little.
- Store tightly closed, cool and dark, and out of reach of children. Child-resistant caps are a good idea for strong oils.
- Watch for color changes and thickening as the oil ages.
Common Mistakes With Cinnamon Oil
- Assuming all cinnamon oils are the same. Bark, leaf and cassia differ in chemistry and risk.
- Using it neat on skin or in “hot” massage oils.
- Adding it to bath water.
- Swallowing drops in water, tea or capsules.
- Diffusing heavily in small rooms, around children or near pets.
- Following recipes that list “cinnamon oil” at 1 to 3 percent, which is far above recommended skin limits for bark and cassia.
Frequently Asked Questions
Is cinnamon bark or cinnamon leaf oil better?
They do different jobs. Bark oil has the sweet, classic cinnamon scent but is a strong skin sensitizer. Leaf oil smells spicier and more clove-like and is somewhat less risky on skin, though still low-dilution only.
Can you put cinnamon essential oil on your skin?
Only highly diluted. Tisserand and Young recommend maximums of about 0.07 percent for bark oil, 0.05 percent for cassia and 0.6 percent for leaf oil. Many aromatherapists avoid bark and cassia on skin entirely.
Is cassia oil the same as cinnamon oil?
No. Cassia comes from Cinnamomum cassia, while true cinnamon oils come from Cinnamomum verum. Both cassia and cinnamon bark oils are high in cinnamaldehyde.
Is it safe to diffuse cinnamon essential oil?
In small amounts and for short periods in a ventilated room, most adults tolerate it. Use one or two drops in a blend, and avoid diffusing near young children, pets or anyone with breathing problems.
Can I ingest cinnamon essential oil?
Do not swallow it at home. Food companies use tiny, controlled amounts as flavoring. Concentrated oil can burn the mouth and throat and has caused poisonings in children.
Is cinnamon oil safe for cats?
No. The ASPCA lists cinnamon oil among essential oils that can be harmful to pets, and cats are especially sensitive.
