TLDR — Ceylon vs Cassia Cinnamon
- Cassia cinnamon contains 1–12mg coumarin per gram. Ceylon contains 0.004mg/g — 250–3000× less.
- The EU TDI (tolerable daily intake) for coumarin is 0.1mg/kg bodyweight — a 60kg adult should consume no more than 6mg/day
- 1/2 tsp of Cassia cinnamon (2g) can contain 2–24mg coumarin — potentially exceeding the EU TDI
- Coumarin causes liver toxicity in susceptible individuals — idiosyncratic (genetically determined) hepatotoxicity
- For blood sugar management requiring 1–6g/day, only Ceylon cinnamon is safe at these doses
- Most cinnamon sold in India, the US, and Europe is Cassia — often without labelling clarity
What Is Coumarin and Why Does It Matter?
Coumarin is a naturally occurring fragrant compound found in many plants. It is responsible for the sweet, hay-like scent of freshly cut grass. In cinnamon, coumarin is present at very different levels depending on species.
Why coumarin is a concern: In studies dating from the 1950s–1970s, coumarin was shown to be hepatotoxic (liver-damaging) and potentially carcinogenic in rats. Subsequent human data showed hepatotoxicity occurs in genetically susceptible people:
- The CYP2A6 enzyme variant affects coumarin metabolism
- Approximately 0.5–5% of people are “coumarin poor metabolisers” who accumulate higher coumarin blood levels
- In these individuals, daily exposure to moderate coumarin amounts causes elevated liver enzymes (a marker of liver damage)
The European Food Safety Authority (EFSA) reviewed the evidence and established a TDI (tolerable daily intake) of 0.1mg coumarin per kg bodyweight.
The Numbers — Species Comparison
Ceylon vs Cassia Cinnamon — Complete Comparison
| Parameter | Ceylon Cinnamon (C. verum) | Cassia Cinnamon (C. aromaticum / cassia / burmannii) |
|---|---|---|
| Also known as | True cinnamon, Sri Lanka cinnamon | Chinese, Indonesian, Vietnamese, or Saigon cinnamon |
| Coumarin content | 0.004mg/g (negligible) | 1–12mg/g (1000–3000× higher) |
| Safe therapeutic dose | 1–6g/day (1/4–1.5 tsp) | Maximum 0.5g/day (1/8 tsp) for 60kg adult |
| Blood sugar evidence | Strong — multiple RCTs | Also documented, but safety limits restrict dose |
| Flavour | Delicate, sweet, complex, light | Strong, spicy, intense, slightly bitter |
| Quill structure | Multi-layered, thin, paper-like — crumbles easily | Single thick hard roll — difficult to break |
| Colour | Light tan-brown | Darker reddish-brown |
| Price | More expensive | Less expensive — majority of market |
| What is sold in India | Specialty stores, online, some spice shops | Default in most markets (often unlabelled as Cassia) |
For occasional cooking use, Cassia is fine. For daily therapeutic doses targeting blood sugar, Ceylon is the only safe choice.
The EU and WHO Position
European Food Safety Authority (EFSA): Established TDI of 0.1mg coumarin/kg bodyweight/day. For a 60kg adult: 6mg/day maximum. Since Cassia contains 1–12mg/g, this means maximum 0.5–6g Cassia per day depending on coumarin content (which varies significantly).
European Commission: Restricted coumarin in food to maximum 0.1mg/kg in most food categories; 50mg/kg for traditional seasonings.
German Federal Institute for Risk Assessment (BfR): Issued specific warnings against daily therapeutic consumption of cinnamon powder unless verified as Ceylon species.
Who Is Most at Risk from Cassia Coumarin?
People taking cinnamon for blood sugar: The studied doses (1–6g/day) are therapeutic doses. At these doses, Cassia coumarin exposure is potentially harmful to susceptible individuals.
People with existing liver conditions: Any liver impairment reduces coumarin clearance, increasing hepatotoxicity risk.
People on warfarin: Coumarin is the precursor to warfarin (the blood thinner). High coumarin intake can interfere with warfarin therapy.
Children: Body weight is lower, so the daily safe dose is proportionally much lower.
How to Tell Ceylon from Cassia
Physical examination (most reliable home method):
| Feature | Ceylon | Cassia |
|---|---|---|
| Quill structure | Multi-layered, like cigars rolled of paper | Single thick, hard tube |
| When pressed | Crumbles, layers separate | Does not crumble, hard |
| Cross-section | Multiple thin layers visible | Solid single layer |
| Colour | Light tan | Darker reddish-brown |
| Price | More expensive | Cheaper |
Taste test: Ceylon is sweeter, more delicate, and complex. Cassia is stronger, spicier, and slightly more bitter.
Lab test: Gas chromatography can definitively identify the species by volatile compound profile.
The Bottom Line for Daily Cinnamon Use
Cinnamon Use — Safe Recommendations by Purpose
| Use Case | Safe Cinnamon Type | Recommended Dose |
|---|---|---|
| Chai and occasional cooking | Either Ceylon or Cassia is fine | Pinch to 1/4 tsp — no concern either way |
| Daily golden milk | Ceylon recommended | 1/4 tsp Ceylon daily — safe, beneficial |
| Blood sugar management (therapeutic) | Ceylon ONLY | 1/2–1 tsp Ceylon daily — inform your doctor |
| Children's food | Ceylon preferred | Small amounts only in cooking |
| Supplements/capsules | Verify species before purchase | Choose Ceylon-certified supplements |
For anything beyond occasional cooking, verify you have Ceylon cinnamon before establishing a daily habit.
Frequently Asked Questions
Q How do I identify which type of cinnamon I have?
How do I identify which type of cinnamon I have?
Press the quill firmly — Ceylon crumbles into layered sheets; Cassia is hard and does not break easily. Ceylon quills are much thinner (like rolled paper), lighter in colour, and crumble when scratched with a fingernail. Cassia is thick and woody. If it is already powder, ask the supplier for species verification or look for a Ceylon-specific label.
Q Is Cassia cinnamon unsafe for everyone?
Is Cassia cinnamon unsafe for everyone?
No — coumarin hepatotoxicity appears to be idiosyncratic (genetically determined). Most people can consume moderate amounts of Cassia without harm. The EU TDI is set conservatively for the most susceptible individuals. For occasional cooking use, Cassia is not a concern. The risk applies specifically to people consuming large daily therapeutic doses.
Q Does the cinnamon in MDH, Everest, or MTR masala have this problem?
Does the cinnamon in MDH, Everest, or MTR masala have this problem?
Commercial spice blends use tiny amounts of cinnamon — the coumarin contribution from a pinch of garam masala is negligible. The concern is specifically for people intentionally consuming 1/2–2 tsp cinnamon daily as a supplement for blood sugar management.
Q Where can I buy authentic Ceylon cinnamon in India?
Where can I buy authentic Ceylon cinnamon in India?
Specialty spice stores, online organic retailers, and Ayurvedic pharmacies are more likely to carry verified Ceylon cinnamon. Look for Sri Lankan origin labelling or ask for species verification. The price difference (Ceylon costs more) is a practical indicator.
Available at Organic Mandya
Organic Cinnamon (Variety Verified)
Cinnamon with species verification. Organic. Lab tested for purity and authenticity.
Last updated: March 2026
Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or a qualified healthcare provider before making dietary changes, especially if you have a medical condition.