Cinnamon
A common spice studied for modest blood-sugar effects.
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What it is
Cinnamon is a culinary spice whose compounds have been studied for blood sugar. Two main types exist: Ceylon ('true' cinnamon) and the more common cassia.
How it works
Cinnamon's compounds are studied for modestly improving insulin sensitivity and blood sugar. Effects are small and inconsistent, and the type matters: cassia is high in coumarin (which can harm the liver in large amounts), while Ceylon is low in it.
What it's been studied for
Taken to support healthy blood sugar.
What the evidence shows
Studies are mixed and modest — some show small reductions in fasting blood sugar, others little effect. A gentle add-on at best, not a substitute for proven measures.
Who should consider it
It's used to support healthy blood sugar as a gentle add-on. Given the mixed evidence, it's a minor complement to diet, not a substitute for proven measures.
Amounts commonly studied
Studies use a range, commonly around 1-6 g per day.
How to take it
Studies use around 1-6 g per day. For regular supplementation, choose Ceylon cinnamon to avoid the coumarin in cassia. Culinary amounts are safe.
Forms & absorption
Ceylon cinnamon is preferred for regular supplementation because cassia is high in coumarin, which can harm the liver in large amounts.
Food sources
Ceylon ('true') and cassia cinnamon as a culinary spice.
Safety & interactions
Culinary amounts are safe. Important: cassia cinnamon is high in coumarin, and large daily doses can stress the liver — choose Ceylon for supplemental use, and coordinate with a provider if you take diabetes medication.
Myths & what it won't do
Myth: cinnamon meaningfully controls blood sugar. Reality: studies are mixed and effects are small — a gentle add-on at best. Myth: all cinnamon is the same. Reality: common cassia is high in coumarin, which can stress the liver at high daily doses; Ceylon is the safer supplemental choice.
Common questions
- Does cinnamon lower blood sugar?
- Studies are mixed — some show small reductions in fasting glucose, others little effect. It's a gentle add-on, not a treatment.
- Ceylon or cassia?
- For regular supplement doses, choose Ceylon — common cassia is high in coumarin, which can stress the liver in large amounts.
- Is cooking with cinnamon fine?
- Yes — culinary amounts are safe; the coumarin concern applies to large daily supplemental doses of cassia.
The amounts listed here are what published research has used — not a prescription or a recommended dose for you. Confirm anything you plan to take with your own healthcare provider, especially if you take medications, are pregnant or nursing, or have a health condition.
Related goals
Research on Cinnamon
Recommendations on this page are informed by published research. This is educational information, not medical advice.
- Allen RW, Schwartzman E, Baker WL, et al. Cinnamon use in type 2 diabetes: an updated systematic review and meta-analysis. Ann Fam Med. 2013;11(5):452-459. View study →Note: Cinnamon was associated with modest improvements in fasting glucose and lipids, but effects on longer-term control (HbA1c) were not established and study quality varied.