What is cinnamon?
Cinnamon is a spice made from dried tree bark. There are several kinds, and the cinnamon most people have in their kitchen is just one of them.
As a supplement, it's mainly used for blood sugar support. But the amounts of helpful compounds and compounds to be careful with vary a lot by type, so which kind you choose matters most.
Why cinnamon may help blood sugar
- It slows sugar absorption. It interferes with the digestive enzymes (like alpha-glucosidase and amylase) that break down carbs from rice and bread into sugar, so your blood sugar spikes less after meals.
- It contains a compound that acts like insulin. A compound in cinnamon called MHCP is known to act similarly to insulin (the hormone that lowers blood sugar).
- There's a lot of research on improving insulin resistance (when blood sugar doesn't come down well even with insulin present).
It also has anti-inflammatory and antibacterial effects.
Ceylon cinnamon vs cassia
| Type | What it's like | Recommendation |
|---|---|---|
| Cassia (from China; the most common cinnamon) | Cheap and common. Low in helpful compounds (polyphenols) and high in coumarin. | Not recommended for daily use |
| Ceylon cinnamon (from Sri Lanka, India, etc.) | Pricier, but high in polyphenols, with about 1/10 the coumarin of cassia | The one to choose for daily use |
| Coumarin-free patented extract (Cinnulin, etc.) | Only the active compounds are extracted with water, so there's almost no coumarin. The most expensive. | Taking capsules long term |
How to take cinnamon and how much
Capsules
- For 650 mg capsules, 1–2 at a time, 2–3 times a day
- Taking it with meals makes it easy to time with after-meal blood sugar.
Powder
- Sprinkle 1/2 to 1 teaspoon of Ceylon cinnamon powder into a cup of coffee. It pairs well with coffee.
- You can also open a coumarin-free extract capsule and add about half of it to your coffee.
Cinnamon side effects and cautions
- Liver strain (coumarin): Eating a lot of cassia can expose your liver to too much coumarin. Be especially careful if your liver enzymes are high.
- Blood clotting: Coumarin tends to interfere with blood clotting. If you take an anticoagulant like warfarin, talk to your doctor first.
- Low blood sugar: Taken with diabetes medication, it can drop your blood sugar too low, making you dizzy or shaky. If that happens, take less or stop.
What to take with cinnamon
It's fine to take it with other blood sugar supplements like banaba. But stacking several blood sugar–lowering ingredients can cause low blood sugar, so if you take diabetes medication, add them one at a time and watch how you feel.
Medications and conditions to watch
- Check Warfarin (anticoagulant) — Coumarin interferes with clotting and may raise bleeding risk — talk to your doctor
- Check Diabetes medications (blood sugar–lowering drugs) — Blood sugar may drop too low — take less if you feel dizzy or shaky
- Check Liver disease or high liver enzymes — The coumarin in cassia strains the liver — use only Ceylon or coumarin-free products
Combinations
Works well with: Banaba Leaf Extract
Frequently asked questions
Does cinnamon really help blood sugar?
Many studies suggest it slows sugar absorption and helps insulin work better. But the effect is moderate and results vary between studies, so think of it as an add-on to diet and exercise.
What's the difference between Ceylon and regular cinnamon?
Most everyday cinnamon is cassia. Cassia is cheap but high in coumarin, which can strain the liver. Ceylon cinnamon has about 1/10 the coumarin, so it's safer for daily use.
Can I put cinnamon in my coffee?
Yes, it pairs well with coffee. Sprinkle in about 1/2 to 1 teaspoon of Ceylon cinnamon powder. Avoid adding large amounts of cassia every day.
Are cinnamon supplements bad for your liver?
The issue is coumarin, which is high in cassia. Choosing Ceylon cinnamon or a coumarin-free extract (Cinnulin) greatly reduces the risk. If your liver enzymes are high, talk to your doctor first.
Can I take cinnamon with diabetes medication?
Your blood sugar could drop too low, so talk to your doctor first. If you feel dizzy or shaky while taking both, it may be a sign of low blood sugar.
Related concerns
Last updated 2026-10-12