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NOTICE!!! Anyone taking Ceylon Cinnamon as a blood glucose regulator may want to stock up, given the disaster in Sri Lanka.

The Madagascar and Vietnam cinnamon are a different species, and do not regulate blood glucose anywhere near as well, if at all. No country of origin means possibly Indonesia or China, with all that a Chinese source implies...

[Fungi]

True cinnamon, Cinnamomum verum, is native to India, Sri Lanka, Bangladesh and Myanmar.
• Cinnamomum burmannii, commonly called Indonesian Cinnamon, Indonesian Cassia, or Java Cinnamon
• Cinnamomum cassia, also known as Cinnamomum aromaticum,and commonly called Chinese Cinnamon or Chinese Cassia
• Cinnamomum loureiroi, commonly called Vietnamese Cinnamon, Vietnamese Cassia,Saigon Cinnamon, or Saigon Cassia