Is cassia cinnamon healthy?

Cassia cinnamon comes from the Cinnamomum cassia tree, also called Cinnamomum aromaticum. It originated in Southern China and is also known as Chinese cinnamon. 

Cassia has long been used in cooking and in traditional Chinese medicine. Roughly 95% of its oil is cinnamaldehyde, which gives cassia a very strong, spicy flavor. 

Cassia has been used in several studies of humans with and without type 2 diabetes. Most of these observed significant reductions in fasting blood sugar levels within several months of use. 

The standard dose of cassia was between 1–6 grams per day. It had minimal side effects or none at all.