I tested three species of cinnamon as powders for glycemic index (GI) response: Ceylon cinnamon (Cinnamomum verum or zeylanicum, also referred to as "true cinnamon"), Cassia cinnamon (Cinnamomum cassia or aromaticum), and Saigon cinnamon (Cinnamomum loureiroi, also known as Vietnamese cinnamon). Though Cassia is thought inferior to Ceylon or completely ineffective in some bodybuilding circles, it has lowered glycemic response in both published studies and in my experience. This is fortunate, since Cassia is what is most often found at coffee shops and restaurants if you ask for"cinnamon."
I found Saigon cinnamon to be most effective, with Cassia in close second place and Ceylon in much further third place.
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