The cinnamon in most kitchen cabinets isn’t Ceylon cinnamon. It’s cassia, a related but distinct species with a stronger flavor, higher levels of a potentially liver-damaging compound called coumarin, and a much lower price tag. Ceylon cinnamon, sometimes called “true cinnamon,” comes from a different tree, tastes milder and more complex, and contains only trace amounts of coumarin. The differences matter most if you eat cinnamon regularly or in large amounts.
They Come From Different Trees
Ceylon cinnamon comes from Cinnamomum verum, a tree native to Sri Lanka. Its older botanical name, Cinnamomum zeylanicum, comes from Ceylon, the former name for Sri Lanka. The country remains the only regular supplier of true cinnamon bark and leaf oils.
When a product in the U.S. is simply labeled “cinnamon,” it’s almost always one of three cassia species: Chinese cinnamon (Cinnamomum cassia), Indonesian or Korintje cinnamon (Cinnamomum burmannii), or Vietnamese/Saigon cinnamon (Cinnamomum loureiroi). These are all closely related to each other and quite different from Ceylon. Indonesian cinnamon is the most common variety on American grocery shelves, while Vietnamese cinnamon tends to be the strongest in flavor.
How They Look and Taste
You can tell them apart visually, especially in stick form. Ceylon cinnamon sticks are tan-brown, with many thin, soft layers rolled tightly together, almost like a cigar. Cassia sticks are dark reddish-brown, thicker, rougher in texture, and typically curl inward from both sides to form a single hollow tube.
The flavor difference comes down to chemistry. Cassia cinnamon is dominated by cinnamaldehyde, the compound that gives cinnamon its bold, familiar punch. It accounts for 92 to 98 percent of cassia’s volatile oil profile. Ceylon cinnamon contains cinnamaldehyde too, but in lower concentrations. Its flavor leans lighter and more nuanced, with natural sweetness, citrusy notes from monoterpene compounds, and a subtle warmth from eugenol (the same compound that gives cloves their aroma). Ceylon also contains more natural sugars and fruit acids like malic acid, which contribute to its more layered taste.
If you’re used to the sharp, spicy kick of cassia in cinnamon rolls or chai, Ceylon will taste noticeably milder. Some people prefer that subtlety. Others find it underwhelming for baking.
The Coumarin Gap
This is the difference that gets the most attention, and for good reason. Coumarin is a naturally occurring plant compound that, in large or sustained doses, can damage the liver. Cassia cinnamon contains a lot of it. Ceylon cinnamon contains almost none.
Lab testing puts the numbers in stark contrast. Ceylon cinnamon sticks from Sri Lanka contain roughly 3 to 23 milligrams of coumarin per kilogram. Cassia powder ranges from about 2,100 to 4,400 milligrams per kilogram, based on data from the German Federal Institute for Risk Assessment. That’s roughly 100 to 250 times more coumarin in cassia than in Ceylon.
In practical terms, one teaspoon (about 5 grams) of cassia powder contains somewhere between 5 and 11 milligrams of coumarin, depending on the source. Vietnamese cassia tends to run higher. The European Food Safety Authority sets the tolerable daily intake for coumarin at 0.1 milligrams per kilogram of body weight. For a 150-pound (68 kg) adult, that works out to about 6.8 milligrams per day. A single teaspoon of some cassia powders can exceed that limit.
For the occasional sprinkle on oatmeal, this isn’t a concern. But people who take cinnamon daily as a supplement, add it heavily to smoothies, or brew it into tea could accumulate meaningful coumarin exposure over time. One published case report documented a young woman who developed liver injury after drinking cinnamon-infused water daily for a month, following years of consuming it several times a week for weight loss.
Which One Is Better for Health?
Cinnamon in general has been studied for its potential effects on blood sugar, and some clinical trials have shown modest benefits. However, most of these studies used cassia cinnamon, not Ceylon. That creates an awkward situation: cassia has more research behind it, but it also carries the coumarin risk that makes daily use questionable.
Ceylon cinnamon is the safer choice for regular consumption precisely because its coumarin content is negligible. But the evidence specifically linking Ceylon to blood sugar improvement is thinner. If you’re interested in cinnamon for metabolic health, Ceylon lets you use it consistently without worrying about liver strain, even if the direct clinical evidence is still catching up.
Why Ceylon Costs So Much More
Ceylon cinnamon typically costs about 10 times more than cassia. The reasons are straightforward. It grows in a limited region of Sri Lanka. The bark is thinner and more delicate, requiring skilled workers to hand-peel and roll it into quills. A single worker can produce only 2 to 3 kilograms of finished quills per day. Cassia, by contrast, grows widely across Southeast Asia and China, has thick bark that’s simpler to harvest, and lends itself to large-scale mechanical processing.
How to Know What You’re Buying
Labels are surprisingly unhelpful. Research examining cinnamon labels across 40 international markets found that most Ceylon cinnamon products failed to clearly state their low coumarin content or provide traceability. Meanwhile, cassia products often carry vague labels that simply say “cinnamon” without specifying the species.
A few things to look for:
- Species name: Look for “Cinnamomum verum” or “Cinnamomum zeylanicum” on the label. If it says “Cinnamomum cassia,” “Cinnamomum burmannii,” or just “cinnamon,” it’s cassia.
- Country of origin: Sri Lanka is the primary source for Ceylon cinnamon. If the origin is listed as China, Indonesia, or Vietnam, it’s cassia.
- The word “Ceylon” or “true cinnamon”: These terms aren’t regulated everywhere, but reputable brands use them accurately, especially when they’re charging a premium.
- Stick appearance: If you’re buying sticks, Ceylon’s thin, multi-layered, tightly rolled quills are easy to distinguish from cassia’s thick, single-layer curls.
Ground cinnamon is harder to verify visually. Ceylon powder tends to be lighter in color, but once it’s ground, you’re largely relying on the label and the brand’s reputation. If the price seems too good for something labeled Ceylon, it may be cassia or a blend.