Cilantro Essential Oil (US)
Cilantro is the common term used in the United States to describe the essential oil produced from the leaves and stalks of Coriandrum sativum. It may also be referred to (to a lesser extent in the United States) as coriander leaf essential oil. It is worth noting that the chemical components of the seed essential oil and the leaves/stalks essential oil differ.
Cilantro essential oil has a lesser content of linalool (alcohols) than the seed essential oil and contains a high proportion of decyl aldehyde (aldehydes). Alcohols are generally less “reactive” chemical components in essential oils than aldehydes, although aldehydes are often more fragrant than many other chemical components.
Coriander Essential Oil (UK)
In the United Kingdom, the term coriander is also used in general when referring to the leaf/stalk essential oil (known as cilantro in the United States: see above paragraph). In summary, there is no real distinction (in name at least) between coriander as a seed or leaf essential oil in the United Kingdom (as there is in the United States), although the terms seed and leaf may be inserted into the name to ascertain which part of the plant the essential oil has been extracted from, and indicating the expected chemical components and therapeutic properties.