MOISTURE BUBBLE SERUM contains high green tea extract. Our unique green tea is derived from Shizuoka prefecture in Japan. Unlike common green tea extract, it is resistant to change in light, heat, and pH. Therefore, this serum could contain 50,000ppm of green tea stably. The antioxidant and catechins in green tea are effective in rejuvenating dying skin cells and reducing irritation and redness. Oil drops with natural herbal serum calm the irritated skin and supply insufficient nutrients instantly. This serum is also one of the Green Tea Line Set consisting of toner, serum, and gel cream.