Cinnamomum cassia
The "common" cinnamon — 95% of cinnamon sold in the US is Cassia, not true Ceylon cinnamon. Contains HIGH coumarin (liver risk at high doses). For blood sugar support, use Ceylon cinnamon instead.
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If you take any medications, review these interactions carefully.
Blood thinners (coumarin), diabetes meds, hepatotoxic drugs.
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Mouth sores, GI upset at high doses. Liver damage from high coumarin with chronic use.
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