Ceylon cinnamon (Cinnamomum verum) is studied most often for its effects on blood glucose regulation, antioxidant activity and inflammatory markers. The evidence base is promising in places and thin in others.
This guide separates what has reasonable support from what is frequently overstated, and explains why the coumarin distinction between Ceylon and Cassia matters most for anyone consuming cinnamon daily.
Why the Species Matters
Much of the popular research attributed to "cinnamon" was conducted on Cassia. Because Cassia carries substantially higher coumarin, the practical dosing conclusions differ significantly between the two species.
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