Rankings / Metabolic Health

Cinnamon (Cinnamomum cassia / verum)

Metabolic Health · Spice / glycemic modifier

Tier C+

glycemicotc
5.2 / 10
Tier C+
Ev 6 Bn 3.5 Sf 5

Bottom line

Read Off Label grades Cinnamon (Cinnamomum cassia / verum) as C+ (5.2/10) based on moderate evidence, low-med benefit magnitude, and a med-risk safety profile.

Real but modest glycemic effect — not a metformin substitute, fine as a low-risk adjunct.

Typical use: 1-6 g/day; Ceylon (true) cinnamon strongly preferred over cassia for daily use; cassia limit ~1 tsp/day for chronic use — OTC.

What this is

Real but modest glycemic effect — not a metformin substitute, fine as a low-risk adjunct. The cassia/Ceylon distinction is the single most-important consumer point because supermarket 'cinnamon' is almost always cassia. People stacking high-dose cassia capsules can hit coumarin-related LFT elevations.

Mechanism

Cinnamaldehyde and methylhydroxychalcone polymer; activates insulin receptor autophosphorylation, inhibits intestinal alpha-glucosidase, slows gastric emptying

Dose & route

1-6 g/day; Ceylon (true) cinnamon strongly preferred over cassia for daily use; cassia limit ~1 tsp/day for chronic use

Citations

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Common questions

Does Cinnamon (Cinnamomum cassia / verum) work?
Read Off Label rates the evidence for Cinnamon (Cinnamomum cassia / verum) as Moderate and the benefit magnitude as low-med, producing an overall grade of C+ (5.2/10). Real but modest glycemic effect — not a metformin substitute, fine as a low-risk adjunct.
Is Cinnamon (Cinnamomum cassia / verum) safe?
Cinnamon (Cinnamomum cassia / verum) has a med risk profile in published human data. Legal status: OTC. This is not medical advice — see the disclaimer.
What is the typical dose for Cinnamon (Cinnamomum cassia / verum)?
1-6 g/day; Ceylon (true) cinnamon strongly preferred over cassia for daily use; cassia limit ~1 tsp/day for chronic use
How does Cinnamon (Cinnamomum cassia / verum) work?
Cinnamaldehyde and methylhydroxychalcone polymer; activates insulin receptor autophosphorylation, inhibits intestinal alpha-glucosidase, slows gastric emptying

This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.