Ceylon cinnamon (Cinnamomum verum) and cassia (Cinnamomum cassia) are two distinct plants sold under the same label in most grocery stores and supplement aisles. The key difference is coumarin content: cassia contains up to 1,000 times more than Ceylon, making Ceylon the clearly preferred form for consistent daily supplementation.
Two Plants, One Name
The cinnamon in your spice rack and the cinnamon that researchers study are often two completely different plants. This isn't a minor labeling issue. It changes the chemistry, the safety profile, and the logic behind taking a daily supplement.
Ceylon cinnamon goes by the Latin name Cinnamomum verum, sometimes written as Cinnamomum zeylanicum. It grows primarily in Sri Lanka, which was called Ceylon under British rule, hence the name. The bark is thin, tan-colored, and peels into delicate, papery layers when dried. Cassia cinnamon is actually a family of related species: Cinnamomum cassia from China, Cinnamomum loureiroi from Vietnam, and Cinnamomum burmannii from Indonesia. The bark is thick, dark reddish-brown, and curls into a single hard tube when dried.
Walk into any American grocery store and pull a jar labeled "ground cinnamon" off the shelf. There is a strong chance it's cassia. The FDA allows both to be sold under the same common name without distinction, so most consumers have no idea which one they're actually buying.
For cooking every few days, this might not matter much. For a supplement you take every morning, it matters considerably.
The Coumarin Gap: Numbers That Tell the Story
Coumarin is a naturally occurring compound found in dozens of plants. At low doses and occasional exposure, it's harmless. At sustained higher doses, it can place unnecessary stress on the liver. Cassia cinnamon happens to be one of the highest natural dietary sources of coumarin available.
Cassia bark powder contains between 1,000 and 12,000 milligrams of coumarin per kilogram, depending on species and origin. Vietnamese cassia tends to run highest. A single teaspoon of ground cassia weighs roughly 2.6 grams. At the low end of that concentration range, one teaspoon delivers about 2.6 mg of coumarin. At the high end, over 31 mg in a single serving.
The European Food Safety Authority set a tolerable daily intake of 0.1 mg coumarin per kilogram of body weight. For a 70 kg adult, that ceiling is 7 mg per day. One teaspoon of high-coumarin Vietnamese cassia can deliver more than four times that amount in a single serving.
Ceylon cinnamon contains roughly 0.017 mg of coumarin per gram. One full gram of Ceylon bark delivers less than 0.02 mg of coumarin total. At any practical supplement dose, Ceylon is effectively coumarin-free. The difference between the two isn't marginal. It runs on the order of 700 to 1,000-fold.
This gap is specifically why regulators in Germany and Sweden have recommended limits on cassia intake for habitual consumers. Occasional culinary use is one risk category. Daily supplementation over weeks and months is another.
Potency: A More Honest Comparison
Cassia contains more cinnamaldehyde, the primary active compound in cinnamon bark. So it sounds more potent. In raw form, it is. But this framing is incomplete.
Ceylon contains a broader spectrum of secondary compounds. Eugenol is essentially absent from cassia but present in meaningful amounts in Ceylon. Ceylon also includes trans-cinnamic acid, linalool, and a range of polyphenols that contribute to its overall activity. The active profile is more complex, not simpler.
Practically speaking, potency in a supplement context means bioavailable actives at a dose you can actually sustain every day without concern. A cassia extract you restrict because of coumarin exposure is not more useful than a Ceylon extract you can take fully and consistently. You cannot separate the coumarin from the cinnamaldehyde in cassia; they arrive together.
Customers often ask us why we chose Ceylon over the cheaper and more widely available cassia. The answer is straightforward: consistent daily use requires a form you can take without monitoring your cumulative coumarin intake over time. Ceylon removes that variable entirely.
How to Decode a Cinnamon Label
Most cinnamon supplements are vague. "Cinnamon" alone, with no species name attached, almost certainly means cassia. Ceylon is more expensive, and manufacturers who use it say so prominently because it's a genuine selling point.
Here's what to check before buying:
- Cinnamomum verum or Cinnamomum zeylanicum: These are the accepted Latin names for Ceylon cinnamon. Either one on the label confirms you have the genuine article.
- Cinnamomum cassia, Cinnamomum aromaticum, or just "cinnamon bark": These indicate cassia, or leave the species unspecified, which amounts to the same thing in practice.
- Country of origin: Sri Lanka means Ceylon. China, Vietnam, or Indonesia almost always means a cassia species.
- Price: Ceylon costs roughly two to four times more than cassia at the ingredient level. An unusually cheap "Ceylon cinnamon" supplement is worth investigating before committing.
- Third-party testing: A reputable brand can provide a certificate of analysis confirming species identity and coumarin levels on request. If that documentation isn't available, that's meaningful information about the brand.
Don't assume the word "organic" changes anything here. Organic cassia is still cassia. The certification describes farming practices, not botanical identity.
What 7,200mg Ceylon with MCT Oil Actually Delivers
The large milligram number on a supplement label can look confusing at first. "7,200 mg Ceylon cinnamon" refers to the whole-herb equivalent: the extract was produced from enough raw bark to equal 7,200 mg of the unprocessed plant. This is standard industry practice for expressing extract potency, not a description of how much powder physically sits in the capsule.
Cinnamon bark's active compounds are present at low concentrations in the raw spice. Extraction removes the inert bulk material and concentrates what's biologically relevant. A well-made 7,200 mg equivalent extract delivers far more active content per capsule than 7,200 mg of raw powder ever could.
The MCT oil in our Ceylon cinnamon and MCT formula is a deliberate formulation decision, not a filler ingredient. Cinnamaldehyde and several other cinnamon constituents have fat-soluble characteristics, meaning absorption improves alongside a fat source. MCT oil, derived from coconut, digests rapidly and provides that absorption support without requiring a full meal. The two ingredients are paired because of how these compounds actually behave in the body.
What the Research Actually Focuses On
The body of research on cinnamon's health properties is large and growing. Studies examine its role in supporting glucose metabolism already within a normal range, its effects on antioxidant markers, and its contribution to maintaining healthy lipid levels already within normal ranges. These are active areas with a meaningful evidence base behind them.
One detail often buried in the methods section: researchers routinely specify which cinnamon species they used, because the species matters for both the results and the safety design of the study. Research intended for long-term human use almost always uses Ceylon, standardized low-coumarin extracts, or explicitly controls for coumarin exposure in the protocol.
The NIH Office of Dietary Supplements notes in its professional cinnamon fact sheet that different studies have used different species and preparations, making direct comparisons between trials difficult. That's honest science communication: the type of cinnamon used is part of a study's methodology. Not all cinnamon trials are studying the same thing.
When evaluating a supplement, asking "which species?" is not nitpicking. It's the first relevant question.
Making the Right Call for Daily Use
Cooking with cassia a few times a week is a fundamentally different situation from taking a cinnamon capsule every morning for 90 days. The first involves small amounts, spaced out, with time for your body to clear any coumarin between exposures. The second is consistent daily accumulation without breaks.
Ceylon is the form consistently used in long-term supplementation research and consistently recommended by nutritional scientists for sustained daily use. Its coumarin content is negligible at any reasonable dose. Its active compound profile is broad. It has centuries of use in traditional wellness practice across South and Southeast Asia, and modern research has largely shifted toward it for human supplementation studies.
If you want to add cinnamon to your routine and take it consistently for weeks or months without monitoring your cumulative intake, Ceylon is the straightforward answer. Not because cassia is dangerous in all contexts, but because Ceylon removes a variable you would otherwise need to actively manage.
The difference between these two plants is real, measurable, and relevant to anyone making a purchase for regular use. Worth knowing before you decide.
Frequently asked questions
Is Ceylon cinnamon the same as 'true cinnamon'?
Yes. Ceylon cinnamon (Cinnamomum verum) is often called 'true cinnamon' specifically to distinguish it from cassia, which dominates the mass market. Ceylon is valued for its thin, layered bark, more complex flavor profile, and very low coumarin content compared to any cassia variety.
Can I just use cassia cinnamon from my kitchen as a daily supplement?
For occasional cooking, cassia is generally fine. For a daily supplement routine sustained over weeks or months, the coumarin content in cassia becomes a real consideration. European regulators have set tolerable daily intake limits that regular cassia consumption, particularly in supplement form, can approach or exceed.
What does 'whole-herb equivalent' mean on a cinnamon supplement label?
It describes extract potency relative to raw plant material. A label reading '7,200 mg Ceylon cinnamon equivalent' means the extract was made by concentrating active compounds from that amount of raw bark into a smaller capsule. The physical weight of the capsule is far less; the number communicates relative strength.
Why is MCT oil paired with Ceylon cinnamon in some formulas?
Key active compounds in cinnamon bark, including cinnamaldehyde, have fat-soluble properties. MCT oil, a rapidly digested fat derived from coconut, supports the absorption of these compounds. Pairing them in one formula helps more of the active material reach your system rather than pass through unabsorbed.
Is Ceylon cinnamon appropriate for long-term daily supplementation?
Ceylon cinnamon contains roughly 0.017 mg of coumarin per gram, making coumarin exposure negligible at typical supplement doses. It is widely considered the appropriate form for sustained daily use, unlike cassia which carries meaningful coumarin content. As with any supplement, check with your healthcare provider before starting a new routine.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Written by Dr. Lena Fischer, Nutritional Scientist.