Why serum?

  With the plethora of skincare options that are available to us today, deciding what product is suitable for your specific needs can be somewhat difficult.  Many skincare lines feature a serum and a moisturizer, and many consumers don't have a clear understanding of the difference between the two.  Do you need both?  Do you use only a serum?  What is a serum?!
  Let me break it down for you in simple terms...
  A serum is essentially a concentrated form of the active ingredients in the moisturizer.  Ideally, it is used in conjunction with the moisturizer (for optimal results) to allow for deeper penetration of said ingredient into the epithelial layers of the skin.  For an individual with dry skin or someone looking to optimize the performance of their chosen skincare product, this system works incredibly well, but, if you've got oily skin or are just looking for a light mositurization, often the serum alone is enough, and added bonus: it absorbs incredibly fast and leaves little to no residue.