Frankincense essential oil (Boswellia frereana, Boswellia carterii, and/or Boswellia sacra) is a tree or shrub that produces a gum or resin that can be steam distilled into an essential oil with HUGE health benefits. Although frankincense trees can be grown anywhere, they are most popular in the Middle East and the region of Oman and Somalia is known for producing the best, highest quality oils today. The aroma of frankincense is uniquely warm, deep, rich, and incense-like. I love it so much I refer to Ol' Frankie as my secret lover. The high level of monoterpenes and sesquiterpenes usually get all the attention with the way they promote the body's natural healing processes.