Gum olibanum (Incense) is a slightly profumed gummy resin produced by different species of Boswellia (Carteri, Frererana, Papyrifera mainly), which grow in Somalia, Ethiopia, Arabia and India.

Gum olibanum is exedud as "tears" as the result of the incisions in the branches of the plants.

On contact with air, this resin solidifies.

First secretion is not used, second is considered just medium quality, and only third one produces the precious incense.