4-in-1 Solution Toner, Essence, Moisturizer, & Facial Oil This proprietary 4-in-1 formula preps and softens like a toner, replenishes like an essence and facial moisturizer, and revitalizes the skin like a facial oil in ONE SIMPLE STEP. FUNCTION: Removes dead skin cells, brightens skin tone, helps fade acne scars, & replenishes from within. Also helps with redness relief and hyperpigmentation.