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Herbal teas, also known as herbal infusions and less commonly called tisanes (UK and US /tɪˈzæn/, US also /tɪˈzɑːn/), are beverages made from the infusion or decoction of herbs, spices, or other plant material in hot water. Oftentimes herb tea, or the plain term tea, is used as a reference to all sorts of herbal teas. Many herbs are used in herbal medicine. Some herbal blends contain actual tea (e.g., the Indian classic masala chai). Herbal teas go back thousands of years. Ancient texts from China and India have documented the use of herbal teas for medicinal purposes. Chinese refer to tisanes as “Liang cha” which means “cooling tea.” One of its uses was to cool down the body when it becomes overheated.
The term "herbal" tea is often used in contrast to the so-called true teas (e.g., black, green, white, yellow, oolong), which are prepared from the cured leaves of the tea plant, Camellia sinensis. Unlike true teas (which are also available decaffeinated), most tisanes do not naturally contain caffeine. There are a number of plants, however, that do contain caffeine or another stimulant, like theobromine, cocaine or ephedrine. Some have the opposite effect, acting as a sedative. Some common infusions have specific names such as coffee, mate (yerba mate), and rooibos (red bush). (Full article...)