What characteristic distinguishes serums from moisturizers?

Serums are differentiated from moisturizers primarily by their lightweight formulation and higher concentration of active ingredients. This allows serums to penetrate deeper into the skin compared to moisturizers, which are typically thicker and primarily focused on providing a barrier to retain moisture. The higher concentration of active ingredients in serums means they are designed to target specific skin concerns, such as fine lines, hyperpigmentation, or uneven texture, effectively delivering potent benefits with just a few drops.

In contrast to serums, moisturizers aim to hydrate and protect the skin surface, creating a barrier that locks in moisture. While moisturizers can contain active ingredients as well, their primary role is to keep the skin hydrated and soothe the skin, which is quite different from the targeted treatment approach of serums. Thus, the characteristics of being lightweight and concentrated make serums a vital addition to many skincare routines, complementing the hydrating effects of moisturizers.