What are the key differences between cassia bark oil and cassia leaf oil?

What are the key differences between cassia bark oil and cassia leaf oil?
Cassia oil splits into two main product types: bark oil and leaf oil, each with distinct economics and applications. Bark oil commands a significant premium due to higher cinnamaldehyde content and more labor-intensive harvesting, while leaf oil is cheaper and often used in industrial chemical applications. The market report identifies these as separate categories with different growth trajectories. For food and beverage use, bark oil is preferred for its richer aroma profile, whereas leaf oil finds more use in cosmetics and chemical synthesis. This price spread creates substitution dynamics: when bark oil prices spike, some manufacturers switch to leaf oil or synthetic cinnamaldehyde, which in turn pressures premium grades.