Complete Guide to Essential Oils/A to Z of essential oils/Oregano

Oregano oil comes from the flowering tops of the Origanum vulgare plant. It has a spicy scent.
 * Oregano (Origanum vulgare)

Properties
Oregano oil is not used in aromatherapy due to its toxicity and irritant effect.

Caution

 * Don't use oregano oil during pregnancy.
 * Oregano oil is very irritating to the skin and mucus membranes.