Short answer: Cassia cinnamon also contains coumarin, which is a consideration at high intakes over long periods — a specific, named caution distinct from the formula's berberine-related interaction profile.
What coumarin specifically is
A naturally occurring compound found in cassia cinnamon (the more common, less expensive cinnamon species) that can affect liver function at higher cumulative intakes over time.
Why this matters if you consume cinnamon from multiple sources
If you regularly consume cassia cinnamon in food, tea, or other supplements alongside this gummy, your total coumarin intake could add up beyond what any single source alone would suggest.
Why this is described as the gentlest of the three ingredients, despite this caution
Even with this specific coumarin consideration, cinnamon remains the mildest of the formula's three ingredients relative to berberine's significantly more active interaction profile.
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