It soothes a cough and eliminates phlegm deposited in the respiratory tracts and the lungs. Frankincense essential oil also provides relief from bronchitis and congestion of nasal tract, larynx, pharynx, bronchi, and lungs. Its antidepressant and anti-inflammatory properties also help relax the breathing passages, which can reduce the dangers of asthma attacks, and its antiseptic qualities give it the reputation of being an immune system booster! It also eases body pain, headaches, toothaches, and balances the rise in body temperature commonly associated with colds.