Essential oils that are inhaled into the lungs are believed to offer both psychological and physical benefits; not only does the aroma of the natural essential oil stimulate the brain to trigger a reaction, but the natural constituents (naturally occurring chemicals) of the essential oils are drawn into the lungs and can also supply physical benefit.
Oils that are applied to the skin are believed to be absorbed into the bloodstream. The components of the various oils are said to aid in a variety of health, beauty and hygiene conditions.
Essential oils are highly concentrated liquids that can be harmful if not used carefully.
Essential oils are very powerful and concentrated, and should never be applied to the skin in their undiluted form. To apply essential oils to the skin, "carrier oils" which are pure vegetable oils are used to dilute the essential oils and "carry" them to the skin. Common carrier oils include sweet almond oil, apricot kernel oil and grape seed oil.