Frankincense is thought to improve mood and balance hormones, particularly in women. One study indicated that combining frankincense with other oils known to promote relaxation was successful in relieving depression in terminally ill patients, and may have also helped with pain management. Another study on mice discovered that frankincense stimulates the part of the brain that regulates emotions, as well as activating a protein involved in the experience of warmth. These effects, when combined, can provide a sensation of calm and peace.