What it is: A serum that helps firm and tone skin's appearance.What it does: It's formulated with the brand's proprietary DMAE and works to visibly refine skin's texture, leaving it smoother, softer and perfectly prepared for treatment.How to use: Apply onto cleansed skin by saturating a cotton pad and smoothing it over your face and neck in the morning and evening. Allow a few moments to dry, then follow with your treatment and moisturizer. Style Name:Perricone Md Serum Prep. Style Number: 258768. Available in stores.