If you’re trying to cut through the marketing hype and decide if serums are worth your while (and your hard-earned MOO-lah), the short answer is: YES! The long answer? It depends on what serum, and more specifically, what ingredients that serum is formulated with. But all ingredients aren't created equal, so there are a few things we suggest you keep in mind while perusing the skincare aisles in search of a serum (or any other skincare product for that matter):