Saigon cinnamon is derived from the bark of cassia trees, which are native to Southeast Asia. Saigon cinnamon, also known as Vietnamese cassia, is one of the sweetest and strongest varieties of cinnamon. It's a member of the Cinnamomun cassia family -- the predominant cinnamon variety sold in the United States, according to Pennington Biomedical Research Center. Saigon cinnamon provides valuable health benefits common to all cinnamon varieties.