[Southflanknorthpawsis]

Cinnamon is a gastrointestinal irritant.

Really? Well maybe the benefits outweigh the risk of that. I don't know.

In what way does it irritate and in what amounts?

[MHGinTN]

As you are aware, aspirin is a gastrointestinal irritant. Cinnamon, like aspirin, irritates the lining of the gastrointestinal tract ... from your mouth to your anus, but the effect is mediated by how long the cinnamon remians in contact with the tissues and the secretory activity of the tissues.