4 oz Essential Oils – 4 fl oz – 100% Pure and Natural – Therapeutic Grade Oil! Cinnamon Bark Cinnamomum zeylanicum Yellow/Brown Thin Strong Peppery, earthy, spicy, bright and slightly woodsy. Cinnamon Leaf Cinnamomum zeylanicum Yellow Thin Mild Peppery, spicy and earthy, with a very slight cinnamon undertone.