Cassia essential oil is a natural botanical extract steam-distilled from the bark, twigs, and leaves of Cinnamomum cassia, or Chinese cinnamon, a tree closely related to but botanically distinct from true or Ceylon cinnamon, Cinnamomum verum; the two are often confused in trade but cassia is typically the cheaper, more intensely spicy material, and its oil is dominated by a very high concentration of cinnamaldehyde, commonly in the range of roughly two-thirds to four-fifths of the oil, alongside smaller amounts of eugenol and coumarin. On the blotter it reads as hot, sweet-spicy, and unmistakably cinnamon-like, with resinous, smoky, honeyed, and slightly woody-balsamic undertones, and it tends to smell sharper, coarser, and less refined or nuanced than genuine cinnamon bark oil, which carries more rounded, complex spice facets. In perfumery it functions as a heart-to-base spice note used to project bold, unapologetic cinnamon heat rather than a subtle background accent, and it appears in spicy oriental compositions, gourmand fragrances, and warm chai- or bakery-style accords, often paired with clove, orange, vanilla, or amber materials. Because of its potency and the aggressive character of cinnamaldehyde, it is used only in very small, carefully metered doses. Cassia oil and its principal constituent cinnamaldehyde are well documented as strong skin sensitizers with a significant risk of allergic contact dermatitis, which has led to substantial IFRA restrictions on its use in fragrance compounds and to allergen-declaration requirements in many finished products. — researched, 2026-09-02.
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