SAFE

Cinnamon

Cinnamomum verum / cassia (bark extract)
Possibly Safe V2 Verified Botanicals
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PubMed Studies
110
About

See Phase 2 cinnamon oil entry. Bark extract provides cassia-specific coumarin concern alongside bioactive cinnamaldehyde and proanthocyanidins. Evidence for blood glucose modulation.

How it works (mechanism of action)

Acts on cellular signalling pathways relevant to the documented clinical indications. Contains bioactive compounds with enzyme-modulating, receptor-binding, or antioxidant properties studied in peer-reviewed literature.

📊 Effectiveness
Blood sugar control
Evidence Grade B · 18 studies · n=2,200
Possibly Effective
Insulin sensitivity
Evidence Grade B · 14 studies · n=1,400
Possibly Effective

Evidence grades: A=Strong RCT evidence · B=Good clinical trials · C=Limited trials · D=Preliminary/traditional

👥 Safety by Population
PopulationSafety RatingMax Safe Dose
DiabetesPossibly safe1-6g/day with monitoring
GeneralPossibly safeNot established
🚫 Contraindications & Warnings

Coumarin: Cassia cinnamon high in coumarin (hepatotoxic at high doses — EFSA maximum 0.1mg coumarin/kg/day). Ceylon cinnamon very low coumarin — preferred. HYPOGLYCAEMIA: blood glucose lowering — monitor with diabetes medications. ANTICOAGULANT: antiplatelet activity. Drug interactions: diabetes medications, anticoagulants.

💊 Drug Interactions (3)
🟡 Antidiabetic drugs
Moderate
Antidiabetic
Management: Monitor blood glucose closely.
🟡 Warfarin
Moderate
Anticoagulant
Management: Use Ceylon cinnamon. Monitor INR with cassia cinnamon.
⚪ Antibiotics
Minor
Antibiotic
Management: Generally beneficial but monitor.
🏷️ Other Names
Cinnamomum verum Cinnamomum cassia Cinnamon bark Ceylon cinnamon
Updated: 2026-04-11
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