Cassia cinnamon contains roughly five percent coumarin, a compound that is hepatotoxic at sustained daily doses. European regulators cap daily cassia intake for exactly this reason.
It was never designed to be taken every day at therapeutic doses for years. If you've tried a cinnamon supplement before and it didn't work, you were almost certainly taking cassia at 500mg.
The wrong species at the wrong dose. The wrong conclusion for the wrong reason.
Resia is 100% true Ceylon cinnamon, Cinnamomum verum, sourced from Sri Lanka. DNA-verified to confirm species. Trace of coumarin. Safe for daily long-term use. Third-party tested for purity, which matters more than it should given the FDA has flagged lead contamination in eighteen cinnamon brands since 2024.
And the dose is where everyone else fails. Most supplements sit at 500mg.
The published research that showed significant results used substantially more. Resia delivers 7,200mg equivalent in a single softgel, suspended in MCT oil so the active compounds actually reach your bloodstream instead of passing straight through your gut.
Same word on the label. Different plant. Different dose. Different result.