Serums are separate from masks as they are a daily part of your routine and are allowed to completely absorb. They also do not include heavy moisturizing ingredients like lotions. They include only the special ingredients that we have learned can help the appearance of and signs of aging. They also do not feel heavy after you have put them on like a lot of moisturizers and lotions. Try a serum out and see if this is a good way of getting what your skin needs!