While just one part of what should be a multi-step, multi-product skincare routine, face serums are arguably the star of the show due to the punch they are able to pack. Though there are many types of serums out there (ranging from skin-brightening, to hydration, to countless others), the crux of their capabilities is the ability to deliver high concentrations of specific ingredients to the skin in the form of a gel-based or liquid product, in a lighter consistency than your typical moisturizing cream. Active ingredients often present in serums include vitamin A, C, and E, as well as topical retinols, botanicals, and antioxidants. Due to the high degree of potency in most if not all serums, be sure to take into account any sensitivity in your skin prior to trying a new serum. Serums are applied to the skin after cleansing, and prior to moisturizing, so they can aid in locking in moisture and deeply penetrate the skin. In addition to locking in moisture, serums are best known for absorbing super quickly (and therefore playing nice with the rest of your routine), soothing sensitive skin, protecting your skin from harsh external factors and damage, balancing out your skin tone, and even smoothing out fine lines and wrinkles all over the face, whether your pain points are around the eyes or the smile lines around your mouth. Looking for a new serum? A great place to start is Dr. Idriss and her “Favorites: Serums” shelf, as well as a deep dive into her comprehensive YouTube channel!