Kiehl's DS Pre-Serum: For daily morning and evening skincare. After cleansing and drying your face, take one dropper and gently smooth over your entire face. Then, tone your skin with toner, serum, and cream. If using during the day, be sure to apply sunscreen. Kiehl's DS Clearly Bright Essence : After cleansing and toning your skin, take one dropper (about the size of a 100 yen coin) and gently smooth over your entire face. Apply gently to areas of concern, pressing with your hands. Kiehl's DS RTN Renewing Serum: After cleansing and toning your face, apply two to three pumps to your entire face, then follow with cream or emulsion. We recommend using it at night. Avoid using on the upper eyelids and lips, where the skin is particularly thin. Avoid contact with eyes. Use one pump on the neck and décolleté. Be sure to apply sunscreen when using this product in the morning. If using this product in conjunction with a clear whitening serum, you can apply the retinol serum after the clear whitening serum. After toning your skin with Kiehl's Rare Earth Poreless Treatment Skincare, which suppresses melanin production and prevents blemishes and freckles, dispense an appropriate amount (roughly the size of a pearl for the entire face) onto your fingertips and spread evenly over your entire face. We recommend applying it over the "butterfly zone," including the cheeks, under the nose, and around the nostrils, as well as the T-zone, where oiliness and shine are particularly common. Allow the serum primer to fully absorb into your skin before applying sunscreen or makeup as needed. It's also recommended for touch-ups and before bed.