Ceylon vs Cassia Cinnamon: Why the Type You Use Matters for Your Health
Pick up a jar of cinnamon from most supermarket shelves and you are almost certainly holding Cassia, not Ceylon. The two look alike, smell similar, and taste roughly the same. But when it comes to daily use for health purposes, the differences between them are significant enough that researchers, regulatory agencies, and nutrition professionals have started drawing a clear line between the two.
This is not a minor labelling technicality. For anyone taking cinnamon regularly — whether as a supplement or a daily addition to food — understanding the distinction between Ceylon and Cassia cinnamon could affect their long-term health outcomes.
What Is Ceylon Cinnamon?
Ceylon cinnamon (Cinnamomum verum, also called Cinnamomum zeylanicum) is often called true cinnamon. It comes primarily from Sri Lanka — the country formerly known as Ceylon — though it is also grown in parts of India, Madagascar, and the Seychelles. Ceylon cinnamon is made from the inner bark of the tree. Harvesters carefully peel away the outer bark and dry the inner bark, which curls into thin, delicate quills with multiple layers. If you roll a Ceylon cinnamon stick between your fingers, it crumbles easily. The flavour is mild, slightly sweet, and more nuanced than the sharper spice most people associate with cinnamon.
Cassia cinnamon — which includes Cinnamomum cassia (Chinese cinnamon), Cinnamomum aromaticum, and Cinnamomum loureiroi (Vietnamese or Saigon cinnamon) — dominates the global market. It is cheaper to produce, grows in larger quantities across Southeast Asia and China, and has a more intense, pungent flavour. The sticks are hard and single-layered, and the bark is much thicker.
The Core Chemical Difference: Coumarin
Cassia cinnamon contains significant amounts of coumarin — a naturally occurring compound that gives it part of its characteristic aroma. Coumarin concentrations in Cassia typically range from 1mg to 12mg per gram of spice, depending on the variety and source. Vietnamese Cassia (Saigon cinnamon) tends to sit at the higher end of this range.
Ceylon cinnamon, by contrast, contains negligible amounts of coumarin — typically less than 0.004mg per gram. This is a difference of roughly 250 to 3,000 times less coumarin than Cassia, depending on which types are being compared.
Why does coumarin matter? The European Food Safety Authority (EFSA) established a tolerable daily intake (TDI) for coumarin of 0.1mg per kilogram of body weight. For an average 70kg adult, that works out to 7mg of coumarin per day as the maximum considered safe for regular consumption. A single teaspoon (roughly 2.5g) of moderately concentrated Cassia cinnamon could already contain 5-10mg of coumarin — meaning one teaspoon of Cassia per day could push a typical person close to or beyond their safe daily threshold.
At higher doses, coumarin has been associated with liver toxicity in animal studies, and case reports in humans have documented liver enzyme abnormalities linked to high cinnamon supplement intake — almost invariably Cassia-based products. We cover this in much more detail in our deep-dive on coumarin in cinnamon.
Why Most Cinnamon Supplements Are Cassia
Cost is the primary driver. Ceylon cinnamon is more expensive to cultivate and process, with lower yields than Cassia varieties. Cassia grows prolifically in China, Vietnam, and Indonesia and can be sourced at a fraction of the price. Labelling regulations in many countries do not require cinnamon supplements to specify the species. A label that simply says cinnamon or cinnamon bark extract could legally refer to any variety. Since Cassia is cheaper, it is the default choice for most mass-market supplement manufacturers.
This creates a real problem for consumers. Someone taking 1-2 grams of cinnamon per day for blood sugar support — which falls well within the range used in research studies — could be consuming anywhere from 1mg to 24mg of coumarin daily if their supplement is Cassia-based. At the upper end, that substantially exceeds the EFSA safe daily intake guidelines.
Research on Cinnamon — Which Type Was Used?
This nuance often gets lost in popular health articles about cinnamon. Many widely cited studies on cinnamon and blood sugar used Cassia cinnamon, not Ceylon. A frequently referenced 2003 study by Khan et al. published in Diabetes Care, which found improvements in fasting blood glucose, triglycerides, and cholesterol markers in Type 2 diabetes patients, used Cassia cinnamon. This does not invalidate the research — the findings are real and the mechanisms appear to involve compounds found in both types, particularly cinnamaldehyde and procyanidins. However, it does mean the blood sugar research and the safety concerns are somewhat at odds when it comes to Cassia: the doses used in studies to achieve effects may overlap with doses that create coumarin exposure concerns.
Ceylon cinnamon sidesteps this issue entirely. Because its coumarin content is essentially negligible, there is no meaningful coumarin accumulation even at higher daily doses. This is why researchers and clinicians who recommend cinnamon supplementation for metabolic health increasingly specify Ceylon as the preferred type for long-term daily use.
Active Compounds: What Actually Drives the Benefits?
Both Ceylon and Cassia cinnamon contain cinnamaldehyde — the primary compound responsible for cinnamon's distinctive aroma and many of its studied health properties. Cinnamaldehyde has been researched for its effects on insulin signalling, anti-inflammatory activity, and antimicrobial properties. Both types also contain procyanidins (type-A), polyphenols that research suggests may influence insulin receptor activation and glucose uptake in cells. The concentrations vary between varieties, with some analyses finding that certain Cassia varieties have higher total cinnamaldehyde content than Ceylon. However, cinnamon's studied benefits are not exclusive to coumarin-containing varieties. Ceylon's active compound profile is sufficient to produce the biological effects studied in research, without the coumarin load.
How to Tell Them Apart
If you are buying cinnamon sticks, the physical differences are fairly reliable. Ceylon sticks are thin-walled, multi-layered, and crumble easily. They look a bit like a tightly rolled cigar made of thin paper layers, and the colour tends to be a lighter tan-brown. Cassia sticks are thick-walled, single-layered, and hard — you would need to break them rather than crumble them. They are darker and denser.
For ground cinnamon and supplements, you cannot distinguish them by appearance. You need to check the label. Look specifically for the Latin species name: Cinnamomum verum or Cinnamomum zeylanicum for Ceylon. If the label just says cinnamon or cinnamon bark extract without specifying the species, it is almost certainly Cassia.
Practical Implications for Different Uses
Occasional culinary use: For adding cinnamon to oatmeal, baking, or coffee occasionally, the type matters less. Coumarin becomes a concern when consumed regularly and in meaningful quantities. A sprinkle here and there is unlikely to create a problem regardless of type.
Daily supplementation: This is where the choice of type becomes genuinely important. Anyone taking cinnamon supplements daily — for blood sugar support, metabolic health, or any other reason — should use Ceylon. The coumarin accumulation from daily Cassia use at supplement-relevant doses is a legitimate concern that Ceylon eliminates entirely.
Children and people with liver conditions: These groups should be particularly careful to use Ceylon if adding cinnamon to their routine, and should consult a healthcare provider regardless of the type.
Why MCT Oil Matters for Cinnamon Absorption
Ceylon cinnamon's active compounds — cinnamaldehyde and the polyphenols — are fat-soluble (lipophilic). This means they dissolve in fats rather than water. When taken in standard powder capsule form, their absorption can be limited by the absence of dietary fat at the time of consumption. Pairing Ceylon cinnamon with a fat source, particularly MCT (medium-chain triglyceride) oil, supports better bioavailability of these fat-soluble compounds. MCT oil is rapidly absorbed and metabolised, making it an efficient carrier for fat-soluble actives. This is the principle behind softgel formulations that use an oil carrier rather than simply packing cinnamon powder into a capsule.
What the Regulatory Agencies Say
The EFSA's coumarin guidance is particularly significant because Europe has taken the most active regulatory stance on this issue. Germany's Federal Institute for Risk Assessment (BfR) has previously advised consumers against consuming high amounts of cinnamon-containing foods daily, specifically because of Cassia coumarin content. The guidance is most relevant to people consuming cinnamon in supplement form or as a deliberate daily health food. In the United States, the FDA classifies coumarin as an unapproved food additive when used as a flavouring, though it remains present naturally in certain spices. The regulatory picture globally reflects a consistent view: coumarin from Cassia is worth being cautious about for regular consumption, while Ceylon's negligible coumarin content places it outside these concerns.
The Bottom Line
Ceylon and Cassia are not interchangeable when it comes to regular health-focused supplementation. Cassia's coumarin content creates a real upper limit on how much can safely be consumed daily, and many supplement products contain doses that approach or exceed this limit. Ceylon cinnamon — true Cinnamomum verum from Sri Lanka — provides the same active compounds with essentially no coumarin risk, making it the appropriate choice for anyone who wants to use cinnamon consistently.
The challenge is that most cinnamon products do not make this distinction clear. The responsibility falls on consumers to check labels, look for species verification, and choose supplements that specify Ceylon. For those looking at daily cinnamon supplementation, choosing a product that clearly identifies Ceylon cinnamon and uses an absorption-supporting format is the most evidence-consistent approach available. Zenca Ceylon Cinnamon is formulated as softgels with MCT oil specifically for this reason — delivering verified Cinnamomum verum in a format designed to support absorption, without the coumarin concerns of Cassia-based products.