What it is: An antiaging treatment that helps to firm and renew skin while intensifying the power of other Perricone MD treatments. What it is formulated to do: Perricone MD Serum Prep tones the skin, providing the ultimate lifting and rejuvenating benefits that can be seen and felt instantly. It effectively decreases the appearance of deep lines and wrinkles, creating a smooth, youthful look. What else you need to know: This paraben-free serum is ideal for skin showing accelerated signs of age. It re-energizes skin cells to increase skin radiance.