Herbs

Cinnamon

Also called: cinnamon extract, cassia

The kitchen spice, in capsule form.

Why people take it
Blood sugar.
What the evidence says
Mixed results for blood sugar.
How it is usually taken
Usually 1 to 2 g a day; Ceylon cinnamon is safer than cassia for regular use because of lower coumarin.
Be careful
Cassia cinnamon contains coumarin, which can harm the liver in large amounts.
Medicines it can interact with
Cassia cinnamon in large amounts may harm the liver; may add to diabetes medicines.

Other herbs

EchinaceaElderberryGarlic extractGingerPeppermint oilMilk thistleSaw palmettoSt John's wortValerianChamomileLemon balmPassionflowerKavaRhodiolaGinkgoMoringaFenugreekBlack seedLicoriceBoswellia

Common questions

What is Cinnamon?

The kitchen spice, in capsule form.

Why do people take Cinnamon?

Blood sugar.

Does Cinnamon work?

Mixed results for blood sugar.

How much Cinnamon do people take?

Usually 1 to 2 g a day; Ceylon cinnamon is safer than cassia for regular use because of lower coumarin.

Is Cinnamon safe?

Cassia cinnamon contains coumarin, which can harm the liver in large amounts.

Does Cinnamon interact with medicines?

Cassia cinnamon in large amounts may harm the liver; may add to diabetes medicines.

Sources and further reading

Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. Supplements are not medicines: they are not tested and approved like drugs before they are sold, and they can interact with medicines. Talk to your doctor or pharmacist before you start one, especially if you are pregnant or breastfeeding, take regular medicines, or have kidney, liver or heart disease.