Green tea leaves were obtained from the Hadong area of Korea. The green tea leaves were ground and pulverized in a mortar, and then mixed with distilled water (DW) for 30 minutes in a 10-L reactor (200 g/4 L). The mixture was incubated at 80 °C for 20 minutes, and centrifuged at 3000 g for 15 minutes at 5 °C. The clear supernatant [normal green tea extract (NGE)] was used for experiments. The green tea extract (4 L) thus prepared was combined with 1 g of tannase (Visionbiochem, Gyeonggi-do, Korea) and then incubated in a water bath at 35 °C for 20 minutes followed by centrifuging at 3000 g for 15 minutes at 5 °C. The supernatant was used as the TGE for further analyses. The compositions of the base formulation (vehicle), the formulation containing 5% NGE (FNGE), and the formulation containing 5% tannase-converted green tea extract (FTGE)