Pebbles is right, here is some information on Jojoba oil....
The Jojoba plant originated in the Sonoran Desert and is presently grown in the southwestern areas of the United States. It is a slow growing plant and takes 12 - 14 years to mature, but has a life span of over 100 years. The bean from this plant is less than two centimeters in length and weighs one gram.
From this bean, a golden, odorless, non-allergic liquid wax is produced that is known as Jojoba Oil. Jojoba Oil's structure imparts qualities and properties that are difficult to match. The chemical content of this oil is found to be the same as sperm whale oil. It is composed of liquid wax esters.
Liquid wax esters make up 25 - 30% of our skin's surface layer called sebum. As we age our rate of wax esters production steadily decreases, particularly in women. Jojoba Oil also has the ability to retard sebum excretion in people with oily skins.
It is suspected that Jojoba Oil "tricks" the skin into stopping the production of sebum through somehow mimicking sebum.
This also means that Jojoba Oil breaks down sebum in plugged-up pores. Sebum and Jojoba Oil will mix readily without sealing off the skin pores. As a result they form a non-greasy, non-tacky layer with exceptional trans-epidermal water control.
Dermatologists have also reported its non-irritating use for acne. Occlusive materials such as mineral oil can cause anaerobic microbial growth and inflammation redness and swelling in and around pores. Jojoba Oil will not cause blackheads that contribute to acne.
Studies have also shown that it is non-irritating to the eyes or skin. The skin rapidly absorbs it, thus pores and hair follicles remain open and can function freely. Another remarkable property is that it is non-greasy and leaves no oily after-feel.
Jojoba also controls transpiration water loss (water loss through skin). It controls flaking and dryness of the skin.