Supplement · Adaptogens & traditional herbs
Cinnamon extract
Also known as: Cassia cinnamon, Ceylon cinnamon
A blood-sugar-support spice with modest evidence, and a coumarin caution for cassia.
- Evidence
- Silver· human data
- Sources cited
- 1
- Last reviewed
- 22 July 2026
Cinnamon is studied mainly for blood-sugar support, with compounds that may improve insulin sensitivity and slightly lower fasting glucose.
Human trials are mixed but suggest a modest glucose-lowering effect in some people, particularly with type 2 diabetes or prediabetes. An important safety point: common cassia cinnamon is high in coumarin, which can stress the liver at high intakes, so Ceylon ('true') cinnamon is preferable for supplement-level doses.