Cinnamomum zeylanicum, also known as true cinnamon, is a sweet-smelling spice commonly used in cooking and baking. This ancient spice is native to Sri Lanka, but is now also grown in other tropical regions. Cinnamon has many health benefits and is a great source of antioxidants, making it a popular ingredient in many traditional medicines. There are several synonyms for Cinnamomum zeylanicum, including Ceylon cinnamon, Sri Lankan cinnamon, and true cinnamon. Other types of cinnamon, such as Cassia cinnamon, have a different taste and aroma and are often used as a substitute for true cinnamon in recipes.