Black tea is derived from oxidized green tea leaves.
Both Green and Black tea have been used for thousands of years in Asia, both as a beverage and a herbal medicine. Green Tea contains natural caffeine and other Phenolic-containing antioxidant compounds. They activate the central nervous system, which spars the body's ability to burn calories and unwanted fat cells through the Thermogenic process. Researchers studying green tea have found it to be an excellent source of potent, bioflavonoid-rich compound that is high in polyphenols, a special class of bioflavonoids. The phenol groups in green tea polyphenols are extremely active, easily able to capture and neutralize free radicals and other pro-oxidants.