There are four common types of cinnamon: Vietnamese, Chinese (cassia), Indonesian, and Ceylon (true) cinnamon. Which is safest in terms of the level of coumarin, which may damage the liver at toxic..
Some herbs and spices--including cinnamon, cloves, lemonbalm, marjoram, oregano, and peppermint--are so rich in antioxidants that just a small pinch can go a long way.
Many of the most powerful drugs in modern medicine's arsenal came from natural products, from penicillin to the chemotherapy agents Taxol® and vincristine.