No purified water or retinol derivatives. Formulated with 0.5% pure, stabilized retinol for powerful anti-aging care. Ideal for skin accustomed to retinol but still showing progressive signs of aging, such as loss of elasticity and dryness. Benefits: Intensive treatment for young and radiant skin! Clinical results in 4 weeks: 22.02% improvement in wrinkles (forehead) 18.40% improvement in wrinkles (nasolabial folds) 17.68% improvement in wrinkles (eye area) 16.91% improvement in elasticity (external elasticity) 13.78% improvement in lifting (corner of the mouth) 4.28% improvement in skin age Clinical results in 2 weeks: 48.87% improvement in pores (volume) 45.74% improvement in pores (area)How to use: In the evening, apply 1 to 2 drops to the hand and pat with fingers from the inside outwards, allow to absorb. Initial use - three times a week. Gradually increase frequency to every other night, use as tolerated. There is a break-in period when using retinol. Week 1~2: Frequency: Use only 2~3 times a week in the evening. Week 3: Frequency: can be applied every other day in the evening. Korean product from the well-known company COSRX.