Firstly, what are Patchouli Oil Dark uses and benefits? For instance, Patchouli Dark essential oil is a type of essential oil commonly used in aromatherapy. Sourced from the leaves of the Pogostemon cablin plant (a perennial herb native to tropical regions of Asia). Subsequently, you can use patchouli essential oil for a variety of health benefits. What are Patchouli Oil additional uses? For example, it has been used for years for helping relieving depression and for providing feelings of relaxation. In addition, you can use it to ease stress or anxiety.