What should you know about Cinnamon traditional uses, evidence and safety?

The short answer

The historical and practitioner record deserves accurate preservation, but the applicable preparation and cultural source should be named. Modern research is highlighted when available without treating lack of research as proof of ineffectiveness. Species and form matter. Cassia cinnamon can contain more coumarin than Ceylon cinnamon. Culinary use is not equivalent to extracts or essential oil; review concentrated use with medicines, liver concerns or pregnancy.