Doterra Cassia essential oil is a close relative of cinnamon and known for its wonderful fragrance. Mentioned in the Old Testament, uses for cassia essential oil go back literally a thousand years both for its fragrance and soothing properties. In addition it is known to promote healthy digestion, supports healthy immune function and is a warming and uplifting aroma. For aromatic, topical, or dietary use. Dilute if applied topically.