eCosmetics is an authorized retailer of Pyunkang Yul.Nutrient Packed Serum.This nutrient rich formula packs in so much goodness, while still being free of essential oil, mineral oil, alcohol and artificial fragrance. Key ingredient Black Tea is rich in antioxidants, also full of catechins and polyphenols which promote elasticity and strong skin barrier. Even better, it absorbs quickly and hydrates all day.