Some folks with diabetes have been able to significantly reduce or even go off insulin by taking the ground cinnamon bark in capsules. I forget the dose. I think in one case it was 2 capsules morning and 2 more evening.
There was a discussion of cinnamon on FR quite a while back. Seems some recommended cinnamon - maybe 1/4 teaspoon? One poster recommended Saigon cinnamon. Capsules appear an easier way to get the proper dosage.