Cinnamon is the spice most people keep in the kitchen and rarely think twice about. But there is one detail that changes everything: not all cinnamon is the same. Ceylon cinnamon and cassia look almost identical, yet they differ sharply in one compound that matters for your liver. Let's look at what the research says about its benefits, about blood sugar, and about which cinnamon is worth choosing.
Does this sound familiar?
- You have heard that cinnamon helps with blood sugar, but you are not sure whether it is true
- You add cinnamon every day and wonder whether it is safe in those amounts
- You do not know the difference between Ceylon cinnamon and the ordinary kind from the shop
Ceylon cinnamon versus cassia: the difference that matters
This is the most useful thing in the whole article, so we are starting with it. There are two main types of cinnamon on the market. Ceylon (Cinnamomum verum, meaning true cinnamon) comes mainly from Sri Lanka. Cassia (Chinese cinnamon) is cheaper, and it is usually cassia that is sold as ground cinnamon in the supermarket.
The difference is not only in price and aroma. Cassia contains a significant amount of coumarin, a compound that in higher doses puts a strain on the liver. An analytical study from 2024 confirms it clearly: Ceylon cinnamon has an extremely low coumarin content, while cassia is the high-coumarin type that is often used even to substitute for the more expensive true cinnamon (Talanta, 2024).
How much does this matter in practice? The European Food Safety Authority has set a tolerable daily intake of coumarin at 0.1 mg per kilogram of body weight, roughly 7 mg for a 70 kg adult (Abraham and colleagues, 2010). The problem is that the coumarin content in cassia varies widely and can reach very high levels, even between pieces from the same tree (Woehrlin and colleagues, 2010). In other words, if you eat cinnamon regularly, Ceylon is the sensible choice, because with it you barely come close to that limit.
π‘ Did you know...
- The ground cinnamon from most shops is usually cassia, not true Ceylon cinnamon.
- Ceylon cinnamon is called "true cinnamon" (Cinnamomum verum) precisely to tell it apart from cassia.
- The sticks of the two types look different: Ceylon is made of many thin, brittle layers like a cigar, while cassia is a single thick, hard piece of bark.
- Thanks to its low coumarin, Ceylon cinnamon can be taken daily without coming near the tolerable daily limit.
Cinnamon and blood sugar: what the data actually shows (honestly)
Blood sugar is exactly what people most often look to cinnamon for, so here we need to be especially honest. The picture is real, but nuanced. A meta-analysis from 2013 found that cinnamon lowered fasting blood sugar and improved lipids, but found no significant effect on the long-term marker HbA1c (Allen and colleagues, 2013). A more recent meta-analysis from 2019 confirmed a reduction in fasting blood sugar and in insulin resistance, but again without a significant change in HbA1c (Deyno and colleagues, 2019).
Here comes the interesting twist. The largest and most recent review from 2025, pooling 28 clinical trials with more than 3,000 participants, now finds a significant reduction not only in fasting and post-meal blood sugar, but also in HbA1c and insulin resistance, with capsule forms and doses of up to around 2 g a day being the most effective (Nutrition Reviews, 2025).
How should you read this? The older analyses saw no effect on HbA1c; the newest and broadest review now does. The signal for lower fasting blood sugar is fairly consistent, but the size of the effect varies between studies. The honest takeaway: cinnamon is a sensible support alongside healthy eating and movement, not a replacement for prescribed treatment. If you have diabetes, do not stop or change your therapy because of a spice.
How is it thought to work? Some of the studies report an improvement in insulin resistance, that is, in how effectively cells respond to insulin. It is this marker (HOMA-IR) that falls in several of the analyses, which is a plausible explanation for why fasting blood sugar drops. The mechanism is still being studied, so treat it as a reasonable hypothesis supported by the data, not as a final truth.
Cinnamon does not replace treatment. It is a support for healthy habits, and choosing the Ceylon type makes it safe for daily use.
Cinnamon and lipids
The effect on blood fats is moderate and also nuanced. A systematic review from 2017 with 13 studies found a significant reduction in triglycerides and total cholesterol, but no reliable effect on "bad" LDL and "good" HDL cholesterol (Maierean and colleagues, 2017). So there is a measurable benefit for part of the lipid profile, but not an across-the-board change. The same principle applies here: realistic expectations and healthy habits first.
Who we are to write about this
Cvetita Herbal has worked for over 10 years as a European manufacturer with European production and over 1 million happy customers. That is exactly why we want to explain the difference between Ceylon cinnamon and cassia, rather than simply sell you "cinnamon". When you take something every day, the quality and the type matter, and we would rather you knew that.
Ceylon Cinnamon Capsules
Our capsules contain pure Ceylon cinnamon (Cinnamomum verum), the true cinnamon with a low coumarin content. The capsule form is convenient for a precise daily dose and, as the newest review of the research shows, it is also the form with the best results for blood sugar. Combine it with balanced eating and movement for the best effect.
π‘ How to use it: Take it according to the dosage on the packaging, ideally with food. The research points to doses of up to around 2 g a day as sensible. If you have diabetes and take medication, speak with your doctor, because cinnamon may add to their effect on blood sugar.
What to realistically expect
As support: cinnamon is an addition to healthy eating and movement, not a standalone solution.
For blood sugar: the signal for lower fasting blood sugar is real; the effect on HbA1c is more modest and varies.
For safety: Ceylon cinnamon is low in coumarin, which makes it suitable for daily use.
What customers say
"I switched to Ceylon cinnamon capsules after I learned about the coumarin in the ordinary kind. It is convenient and I know exactly how much I am taking."
- Sarah W.
"I take it as part of my routine for balanced blood sugar, alongside my diet. My doctor is in the loop and we keep an eye on the numbers."
- James P.
Frequently asked questions
Does cinnamon lower blood sugar?
The research points to a real reduction in fasting blood sugar, and the newest reviews also see an effect on HbA1c. The size varies, so cinnamon is a support, not a replacement for treatment.
What is the difference between Ceylon cinnamon and cassia?
Ceylon (true) cinnamon has a very low coumarin content, while cassia is high in it. That is why, for regular use, Ceylon is the safer choice.
What is the dosage?
Follow the product instructions. The studies use doses of up to around 2 g a day, and the capsule form shows the best results for blood sugar.
Is it safe to take cinnamon every day?
With Ceylon cinnamon, yes, because the coumarin is low. With cassia, large daily amounts can strain the liver. If you have diabetes and take medication, speak with your doctor.
If you want to add cinnamon to your day sensibly, choosing the Ceylon type matters. Its low coumarin makes it suitable for regular use, and the capsule form gives you a precise dose.
GET CEYLON CINNAMONSources
- Allen RW et al. Cinnamon use in type 2 diabetes: an updated systematic review and meta-analysis. Ann Fam Med, 2013. pubmed.ncbi.nlm.nih.gov/24019277
- Deyno S et al. Efficacy and safety of cinnamon in type 2 diabetes and pre-diabetes: a meta-analysis. Diabetes Res Clin Pract, 2019. pubmed.ncbi.nlm.nih.gov/31425768
- Effects of cinnamon supplementation on metabolic biomarkers in type 2 diabetes: a systematic review and meta-analysis. Nutr Rev, 2025. pubmed.ncbi.nlm.nih.gov/38917435
- Maierean SM et al. The effects of cinnamon supplementation on blood lipid concentrations: a meta-analysis. J Clin Lipidol, 2017. pubmed.ncbi.nlm.nih.gov/28887086
- Abraham K et al. Toxicology and risk assessment of coumarin: focus on human data. Mol Nutr Food Res, 2010. pubmed.ncbi.nlm.nih.gov/20024932
- Woehrlin F et al. Quantification of coumarin in cinnamon and cinnamon-containing foods. J Agric Food Chem, 2010. pubmed.ncbi.nlm.nih.gov/20853872
- Pages-Rebull J et al. HPLC-UV combined with chemometrics for the detection of true cinnamon adulteration. Talanta, 2024. pubmed.ncbi.nlm.nih.gov/38266436
Food supplement. It does not replace a varied diet and a healthy lifestyle. It is not a medicine and does not treat disease. If you have diabetes, take blood-sugar medication, have a liver condition, or are pregnant or breastfeeding, consult your doctor before use. The information is for educational purposes and does not constitute medical advice.