Oregano oil comes from the leaves and shoots of the oregano plant.
Botanically known as Origanum vulgare, oregano is a flowering plant from the same family as mint. It is often used as an herb to flavor food.
The oil contains compounds called phenols, terpenes and terpenoids, which have powerful antioxidant properties and are responsible for its fragrance
These compounds are thought to underlie oregano's many health benefits.