Lemon oil has a sharp, fresh smell, is pale greenish-yellow in color and is watery in viscosity. The shelf life of lemon oil is only 8-10 months, if it is to be used in aromatherapy, but can still be used in fragrance therapies after this time, such as vapor therapy. Lemon oil can be very beneficial to the circulatory system and aids with blood flow, reducing blood pressure and helping with nosebleeds. It can help bring down fever, helps relieve throat infections, bronchitis, asthma and flu. It boosts the immune system and cleanses the body, improves the functions of the digestive system, and it is helpful with constipation, dyspepsia and cellulite. Lemon oil soothes and relieves headaches and migraines and is helpful for rheumatism and arthritis. It is also used for clearing acne, cleaning greasy skin and hair, as well as removing dead skin cells, easing painful cold sores, mouth ulcers, herpes and insect bites. Lemon oil helps to fight against infections, aids the digestive system, soothes headaches, migraines and muscular problems and clears greasy skin and hair.