What it is: A Nordstrom-exclusive serum booster with bakuchiol, Zinc PCA and Sodium PCA to help improve the appearance of visible aging. What it does: This intensive treatment also helps even skin's tone and renew radiance. It is designed for use on its own or mixed with a serum, moisturizer or Skin Inc's Custom Recovery Sleep Mask, sold separately. How to use: Remove the cap from the top of the serum. Insert the cap into the base. Inject the