what is serum for face

A face serum is a lightweight, easily absorbed liquid that contains a higher concentration of active ingredients than other skincare products. It is typically applied to the skin after cleansing but before moisturizing. Serums can help to address specific skin concerns such as wrinkles, dark spots, and dryness. They can contain a variety of active ingredients such as hyaluronic acid, vitamin C, vitamin E, ferulic acid, green tea, resveratrol, and collagen peptides. Serums are not moisturizers, but they can help to protect the skin from free radicals and future damage. The prices of serums vary, but the effectiveness of a serum depends on the active ingredients, the formulation, the vehicle, and the stability of the compound.