Serums or Moisturizers???
The difference between a serum and a moisturizer is simple. It's the delivery system. A serum makes it much easier for it's ingredients to penetrate the skin's surface (immediate actually) since it is usually a clear or translucent almost watery substance to begin with. It would be advised to use a serum first and then a moisurizer over it. Although a serum will penetrate the outer layers of the skin more effectively, it won't serve to adequately moisturize your skin enough for make-up application, so only use it in addition to your moisturizer and make sure your daytime moisturizer has an SPF of at least 15. One of the best serums money can buy is the Seven Signs of Aging by Oil of Olay which you can get at your drugstore for around $20.00. Just a few drops will do the trick. You can use morning and night, or, just at night if you like under your nighttime moisturizer.