Several varieties of cinnamon bark come from trees of various species from the Cinnamon genus (6). However, the two most used types are True cinnamon, also known as Ceylon cinnamon or Mexican cinnamon, and Cassia cinnamon, also known as Chinese cinnamon. According to a few studies, Cassia cinnamon can cause exposure to coumarin, a highly hepatotoxic and carcinogenic element found in it (19). Therefore, it is wise to buy certified true cinnamon for babies.