Cinnamon (Cinnamomum cassia / verum)
Metabolic Health · Spice / glycemic modifier
Tier C+
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
- https://pubmed.ncbi.nlm.nih.gov/24019277/
- https://pubmed.ncbi.nlm.nih.gov/22473794/
- https://pubmed.ncbi.nlm.nih.gov/30362102/
Links go to the source. If a link is dead or you want something re-checked, let me know.
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.