It's a supplement. Comes in a pill/gel cap form. They are right there in the vitamin aisle. I get mine at WalMart.
We have many threads about it. You can use the Search button up on the NT toolbar. Just type in cinnamon.
My daughter, who will be 15 tomorrow takes it too. We both have a mega sweet tooth.

I can tell when she misses a few days. Back to the cravings.
I will tell you something funny. Even she jokes about this. She took 2 of the gel caps one morning. A few minutes latter she did a little burp. Out came a little puff of cinnamon.

Better than garlic huh?
If you can't find the threads...I'll search for you. They have links to sources and research.