Say it with us - every skin type needs moisture (especially oily, blemish-prone skin). Dr. Koo’s 4 types of BOOST essential hydration are elegant serums that contain vital nutrients and humectants to calm and preserve healthier, balanced skin. The key is using the right type of moisturizer for your own unique needs. Sustainably sourced avocado oil, prickly pear oil, and wakame seaweed humectants optimize your natural moisturizing factor (NMF) skin layer and enhance effective penetration of Dr. Koo’s retinol and pigment refiner. Your skin’s needs change with your environment, level of stress, decade of life, sleep, and nutrition, and it may even require more than one type of hydration in different environments and seasons. Find yours here!