Citral is also used as a flavor and for fortifying lemon oil. The primary use of nonanol is in the manufacture of artificial lemon oil. Lemon oil may be used in aromatherapy. "Also contains&colon;" Camphor, eucalyptus oil, fragrance, lemon oil. For many years, whilst producing lemon oil, Sicilians had found little use for the juice. Lemon oil is extracted from oil-containing cells in the skin. The essential oil is commonly co-distilled with lemon oil, citronella oil or other oils. Lemon oil aroma does not influence the human immune system, but may contribute to relaxation.