Facial serums are high-potency, lightweight topicals which are formulated with the next concentration of active components — similar to vitamin C and hyaluronic acid — to focus on more specific pores and skin issues. They must be layered underneath your moisturizer — a basic rule of thumb is to apply products with a thinner consistency underneath thicker ones, corresponding to moisturizers and oil. You’ll often hear that consistency is key in life, and this rings true in your Beauty Tips skincare routine as well. “Consistency together with your fundamental routine is key to healthy, glowing pores and skin,” says Dr. …