However, in as far back as the ancient times and ancient civilizations of the Greeks, Persians and Chinese, the massage has been used a medicinal treatment for common ailments. It was mostly used though as preventive medicine and was given a sublime or spiritual association. The wisdom of these ancient people should be incorporated into modern day perspective. After which, when you know enough about the business and the products, you can switch to less established ones but with good reviews. Also, avoid buying essential oils in street fairs and bazaars or from any company that do not have any permanent working address. This is not to say that products in events like this do not have quality; it is just a warning just in case you buy something that you have to return. Armed with the knowledge that they have gotten from the civilizations of the Egyptians and the Greeks, Roman Discorides wrote a book called De Materia Medica, which essays the different properties of as much as 500 plants. In the 11th century, a process called coiled cooling pipe was invented. This had a large impact on the distillation of essential oils. One o the primary benefits of aromatherapy is in the improvement of a person's psychological and mental state. Aromatherapy, they claim, can help relax the mind and get rid of the everyday stress that people suffer from. It can lighten the mood and alleviate stress symptoms such as feelings of depression, heaviness and sadness. Aside from lighting up the aromatherapy candle, there are various wats to enjoy it. Here are some: 1. To enjoy the best aromatherapy candle, make sure that you buy items that contain "aromatherapy candle" label not "scented candle" label. This can assure you that you will enjoy the benefits of pure essential oils as the candles burn into the air. Experts say that the primary functional groups of the essential oils that are being used in aromatherapy today include Monoterpenes, Esters, Aldehydes, Ketones, Oxides, Alcohols, and Phenols. Monoterpenes are those aromatherapy essential oils that contain bactericidal, anti-viral, and antiseptic properties that can cause skin irritation when not used properly.