As the majority of positive research on cinnamon is based on the cassia variety, this is what we use in our Cinnamon 2500mg product. Cinnamon cassia contains a naturally occurring compound called coumarin which in high doses over a long period of time may be harmful to health. The extract we use is GRAS (generally recognised as safe) accredited, and is rigorously tested to ensure a negligible coumarin content of less than 0.5%, so it does not pose any health concerns associated with a high coumarin intake. EFSA (European Food Safety Authority) suggest a maximum tolerable daily intake of 7mg coumarin is permitted. Our extract, at 100mg, contains a maximum of 6mg of coumarin, so well within the permitted safety levels.