The art of aromatherapy had been practiced since the earliest times. Strong evidences were found to link aromatherapy to ancient traditions. Though aromatic oils had been used to treat and cure various ailments and conditions for who knows how long, the formal study on their properties only started in the year 1928. In it's simplest form, aromatherapy is the use of essential plant oils for therapeutic purposes. They are normally employed to relieve a person from stress and a variety of stress-related conditions. And also for promoting an individual's general well being and in invigorating the body and the psyche. Aromatherapy works by inducing the olfactory nerve cells with aromatic oils, which then carries out the message to the limbic system in the brain. Limbic system is the part of the brain that is responsible for controlling memory and emotions. Aromatherapy is concerned in both the workings of the physical and emotional aspects of the person under treatment. Physically, aromatherapy helps in relieving specific conditions trough the stimulation of the nervous, immune and circulatory system. In emotions however, they may evoke pleasant memories. Yet, the medical circles do not agree if aromatherapy in itself is instrumental to the complete healing of a certain condition. But the idea of recovery through aromatherapy is widely accepted. Essential Oils Essential oils are derived from the distillation of the elements of a plant like the leaves, roots, flowers, stems and bark. They hold the true essence of the plants from which they originally came in high concentration. Though termed as oil, essential oils normally do not have the real properties of oil. Some essential oils are yellow like that of the lemongrass and orange and many are clear. These oils are used in a variety of methods: through inhalation, by adding them in the bathwater and by the application of the diluted oil on the body. The use of oil in aromatherapy is only restricted to those with unadulterated qualities. The purest of the essential oils alone have the therapeutic values. The following is a list of the most common essential oils used in aromatherapy. Some of which are used as carrier oils (also known as vegetable oils or base oils): - Almond, Sweet - Apricot Kernel - Avocado - Borage - Cocoa Butter - Evening Primrose - Grapeseed - Hazelnut - Jojoba - Kukui - Macadamia Nut - Olive - Peanut - Pecan - Rose Hip - Sesame - Shea Butter - Sunflower Below are listed essential oils that are not advisable to use in aromatherapy, especially if not supervised by a professional aromatherapy practitioner. - Ajowan - Almond, Bitter - Arnica - Birch, Sweet - Boldo Leaf - Broom, Spanish - Calamus - Camphor - Deertongue - Garlic - Horseradish - Jaborandi - Melilotus - Mugwort - Mustard - Onion - Pennyroyal - Rue - Sassafras - Thuja - Wintergreen - Wormseed - Wormwood Aromatherapists put into practice the workings of aromatherapy in a spectrum of work environments including: - private practice - mobile visiting practice - natural health clinics - beauty therapy clinics - health clubs - hospitals - hospices and - nursing homes. In spite of the lack of formal research on aromatherapy therapists and European physicians are often prescribing certain aromatic oils for a range of complaints including colds and flu, insomnia, sinusitis, migraines, digestive problems and muscle pains. It must be understood though that aromatic oils must never be taken orally and should be first tested to determine the degree of skin's sensitivity to some oils.