Cinnamon Essential Oil: Bark vs. Leaf vs. Cassia, and Safety

Cinnamon essential oil smells like baking day: sweet, spicy and deeply warm. It is also one of the strongest oils there is on skin. Here is how cinnamon bark, cinnamon leaf and cassia oils differ, how to use cinnamon well, and how to keep it safe.

November 2, 2026 · 8 min read

A cinnamon stick in your spice drawer is the dried bark of a tropical tree. Cinnamon bark essential oil is that same bark, distilled down to its scent. One drop in a diffuser and the whole house smells like cinnamon rolls in the oven.

That strength is the point, and also the catch. “Cinnamon oil” on a label can mean three quite different oils, and the one most people want, the bark oil, is the one that needs the most care on skin.

The short version

Our cinnamon essential oil is steam-distilled only from the bark of true Ceylon cinnamon. Our label names it Cinnamomum zeylanicum.
Cinnamon bark, cinnamon leaf and cassia are three different oils. Bark and cassia oils are mostly cinnamaldehyde; leaf oil is mostly eugenol, the main molecule in clove.
Cinnamon bark is one of the strongest skin sensitizers among essential oils. Tisserand and Young set its skin maximum at just 0.07%, less than one drop in 30 ml (1 oz). It belongs in the diffuser.
It is not phototoxic: it won’t make your skin burn more easily in the sun.
One or two drops is plenty. Keep it away from eyes, lips, children and pets, never add it to a bath, and don’t swallow it.

What Cinnamon Essential Oil Is

True cinnamon comes from a small evergreen tree in the laurel family. The spice is its inner bark: harvesters cut young shoots, peel the bark away in thin, papery layers, and let it dry and curl into the soft, many-layered quills sold as Ceylon cinnamon sticks.

A bundle of thin, layered cinnamon quills tied with twine, with three fresh green cinnamon leaves

Ours is true Ceylon cinnamon, grown in a tropical climate, from trees first harvested at about three to four years old. The bark is gathered just twice a year, right after each rainy season, when the damp air softens it enough to peel away easily. Only the bark goes into our oil, and it is steam-distilled: steam carries the bark’s aromatic oil away, and the oil separates from the water as it cools.

Why the label says Cinnamomum zeylanicum

Zeylanicum means “of Ceylon”, the old name for Sri Lanka. Cinnamomum zeylanicum, the name on our bottle, is the classic name for true cinnamon. Today botanists usually call the same tree Cinnamomum verum, “true cinnamon”, so you will see both. Neither is cassia, Cinnamomum cassia, a related tree that supplies much of the ground cinnamon sold in U.S. stores.

Cinnamon Bark vs. Cinnamon Leaf vs. Cassia

All three oils smell like cinnamon, but they come from different parts of the tree, or different trees, and they behave very differently on skin. The difference comes down to two molecules. Cinnamaldehyde gives cinnamon bark its sweet, unmistakable warmth. Eugenol, the main molecule in clove, makes leaf oil smell spicier and more clove-like.

	Cinnamon bark (ours)	Cinnamon leaf	Cassia
Tree	Ceylon cinnamon	Ceylon cinnamon	Chinese cinnamon (Cinnamomum cassia)
Part distilled	Bark	Leaves	Usually leaves and twigs
Main aroma molecule	Cinnamaldehyde	Eugenol	Cinnamaldehyde
Scent	Sweet, rich and warm, like fresh cinnamon sticks	Spicy and clove-like, thinner	Hot and sharp
Tisserand & Young skin maximum	0.07%	0.6%	0.05%

Bark oil is the one that smells like the spice jar. Leaf oil is gentler on skin, but it smells more like clove. Cassia is close to bark oil in scent and just as strong on skin. If a label only says “cinnamon oil”, it doesn’t tell you which one you are buying.

Is Cinnamon Bark Oil Phototoxic?

No. Cinnamon bark oil isn’t phototoxic. Phototoxic oils contain furocoumarins, compounds that react with sunlight on the skin and can cause redness, blistering or dark patches that last for months. They show up mainly in cold-pressed citrus oils such as bergamot, lime and bitter orange. Cinnamon isn’t among the oils known to be phototoxic. Its problem on skin is sensitization, not sunlight.

The sun note on our product pages is a general caution we give for every oil. Cinnamon itself isn’t known to cause sun reactions.

What It Smells Like, and What It Blends With

Our cinnamon is intense, sweet and spicy, with a deep, earthy warmth that lingers. It is cozy and energizing at once: lovely on a gray afternoon, on a chilly evening, or when guests are on their way.

Because it is so strong, use one drop of cinnamon and let the other oils fill out the blend. A few diffuser blends to try, in drops for a standard water diffuser:

Holiday classic: 1 drop cinnamon, 4 drops Blood Orange (more in our blood orange guide)
Warm resin: 1 drop cinnamon, 3 drops Frankincense
Spiced lemon: 1 drop cinnamon, 3 drops Lemon
Winter cabin: 1 drop cinnamon, 3 drops Cypress (more in our cypress guide)

How to Use Cinnamon Essential Oil

In a diffuser

Start with a single drop, two at most, alone or with three or four drops of a partner oil. Diffuse for 30 to 60 minutes at a time rather than all day, in a room with some airflow.

In a simmer pot or potpourri

For a bakery-sweet scent without a diffuser, add one drop to a small pot of water on the lowest heat, with a few slices of orange or apple if you like. Top up the water as it simmers, and never leave it unattended. Or add a drop to a bowl of potpourri or pinecones and refresh it every week or so. Keep both out of reach of children and pets, who may lick or chew them.

On skin: we don’t recommend it

Cinnamaldehyde is a powerful skin allergen. The Tisserand Institute calls it the highest-risk essential oil constituent known from patch testing, and in its survey of people who had used cinnamon bark or cassia oil, 27% reported an adverse reaction. Using the oil undiluted made a reaction more likely.

Tisserand and Young’s 0.07% maximum works out to one drop in at least 75 ml (2.5 oz) of carrier oil. Even one drop in a 30 ml (1 oz) bottle is more than twice that. So our advice is simple: enjoy cinnamon in the air, not on your skin. Never use it neat, never in the bath, and never near the eyes, lips or sensitive areas.

Chaé Cinnamon Essential Oil in a blue 5 ml bottle on a dark wooden board beside a twine-tied bundle of cinnamon sticks and star anise pods

What about the health claims you see online?

Search “cinnamon oil benefits” and you will find claims about blood sugar, germs, circulation and more. Much of that research is on cinnamon the spice, eaten in food, or on lab studies, not on essential oil in a diffuser. In the U.S., an oil sold to treat a health problem is regulated as a drug; ours is sold for its scent, and we don’t make health claims for it. If you are managing a health condition, talk with your doctor.

Using It Safely

Cinnamon bark is one of the oils that asks for the most care. A few simple habits keep it pleasant:

Keep it off skin. If you do use it, stay at or under 0.07%, as above, and patch test first.
Don’t swallow it. Cinnamon flavor in food uses tiny, regulated amounts. A bottle of essential oil is for the diffuser, the simmer pot and potpourri.
Eyes, lips and sensitive areas: keep it well away.
Children: keep the bottle well out of reach, don’t use it on children’s skin, and keep diffusing away from babies and toddlers.
Pets: the PDSA, a UK veterinary charity, lists cinnamon among the essential oils that are toxic to cats. Diffuse only briefly, in a ventilated room your pet can leave, and never put oils on a pet’s skin or fur.
Pregnancy and medical care: check with your doctor first if you are pregnant, nursing, taking medication or under a doctor’s care.
Storage: keep the cap tight and the bottle cool and dark, and use it within about two to three years.

How to Choose a Good Cinnamon Oil

A few things on the label tell you a lot:

Bark, leaf or cassia: the label should say which. They smell different and carry different skin limits.
The species: Cinnamomum zeylanicum or verum for true cinnamon, Cinnamomum cassia for cassia.
Dark glass: light and air break oils down. A clear plastic bottle is a red flag.
Independent standards: our oils are Grade A, Certified ToxicFree® and Leaping Bunny certified. Here is what ToxicFree® certification means.

The Bottom Line

Cinnamon bark oil is pure coziness in a bottle: sweet, spicy and warm, and strong enough that one drop scents a room. It isn’t phototoxic, but it is one of the strongest skin sensitizers there is, so keep it in the diffuser, the simmer pot and the potpourri bowl. Pair a single drop with blood orange or frankincense, and your home will smell like the holidays.

FAQ: Cinnamon Essential Oil

What’s the difference between cinnamon bark and cinnamon leaf oil?

Bark oil is distilled from the bark and is mostly cinnamaldehyde, which gives it the sweet smell of cinnamon sticks. Leaf oil comes from the leaves of the same tree and is mostly eugenol, so it smells more like clove. Bark oil is much stronger on skin.

Is cassia oil the same as cinnamon oil?

No. Cassia comes from a related tree, Cinnamomum cassia, usually from its leaves and twigs. Like cinnamon bark oil, it is mostly cinnamaldehyde and very strong on skin. Ours is true Ceylon cinnamon bark, not cassia.

Can I put cinnamon oil on my skin?

We don’t recommend it. Tisserand and Young set a maximum of 0.07% for cinnamon bark oil, which is one drop in at least 75 ml (2.5 oz) of carrier oil. Never use it neat or in the bath.

Is cinnamon bark oil phototoxic?

No. Cinnamon isn’t among the oils known to be phototoxic; that is mainly a problem with cold-pressed citrus oils. Its risk on skin is sensitization, not sun sensitivity.

Is cinnamon oil safe to diffuse around pets?

Be careful, especially with cats. Use one drop, diffuse only briefly in a ventilated room your pet can leave, and keep simmer pots and potpourri out of reach. Ask your vet if your pet has breathing problems.

How long does cinnamon essential oil last?

Kept tightly capped, cool and out of the light, about two to three years. If it smells flat or “off”, it is time for a fresh bottle.

Sources

Tisserand R, Young R. Essential Oil Safety: A Guide for Health Care Professionals, 2nd edition. Churchill Livingstone / Elsevier, 2014.
Tisserand Institute — New Survey Reveals Dangers of Not Diluting Essential Oils (cinnamon bark and cassia survey).
European Medicines Agency — Cinnamomi cassiae aetheroleum, summary report (Committee for Veterinary Medicinal Products).
Royal Botanic Gardens, Kew — Plants of the World Online: Cinnamomum verum J.Presl (with Cinnamomum zeylanicum Blume among its synonyms).
PDSA — Cats and essential oils.
U.S. Food & Drug Administration — Aromatherapy.
National Association for Holistic Aromatherapy — Safety Guidelines.

Product spotlight

Every Chaé essential oil is 100% pure, Grade A, Certified ToxicFree® and Leaping Bunny certified, with the plant named on the label. Start with cinnamon, then add a warm partner.