Theaflavin (TF) and its derivatives, known collectively as theaflavins, are antioxidant polyphenols that are formed from the condensation of flavan-3-ols in tea leaves during the enzymatic oxidation (sometimes erroneously referred to as fermentation) of black tea. Theaflavin-3-gallate, theaflavin-3'-gallate, and theaflavin-3-3'-digallate are the main theaflavins. Theaflavins are types of thearubigins, and are therefore reddish in color. Epigallocatechin gallate (EGCG) will metabolize into some theaflavins in the liver

1. Black tea powder have anti-inflammatory effect; 
2. Black tea powder can absorb heavy metals and alkaloids, and precipitation decomposition;
3. For vascular system and heart stimulants to speed up blood circulation, promote metabolism;
4.Black tea powder with anti-caries, stomach digestion, anti-aging, blood sugar, blood pressure, blood fat, 
   anti-cancer, anti-radiation effect;
5.Increased renal blood flow, inhibit tubular reabsorption of water, let increased urine output which is 
   beneficial to rid the body of lactic acid, ease of edema caused by heart disease or nephritis.

1.Application in food field : Tea polyphenols as a natural antioxidant widely application in food industry field ;used in all kinds of alcohol drink 
2.As natural additive used in cosmetics and daily necessities field: Have strong antibacterial function and inhibitory enzyme action.