Prereq is short for "prerequisite"—the thing you need before everything else. In school, a prerequisite is the class you have to take before the next one. For us, Prereq is the foundation. The starting point. The first step in taking care of your skin the right way, before you get into all the complicated stuff you don't need yet. It's skincare 101—the basics done right. Prereq is short for "prerequisite"—the thing you need before everything else. In school, a prerequisite is the class you have to take before the next one. For...MORE