Green tea is the main ingredient for this serum: it's not the green tea we're used to drinking, but a unique variety that the company grows in their USDA-organic farm on Korea's Jeju Island and that's rich in 16 hydrating amino acids. The organic green tea leaves are plucked from the stem, steamed for 30 seconds to retain nutrients, and pressed; the extract is then stabilized for freshness and purified for safe use.