While I was hanging out at the Jurlique store and spa earlier this week, I learned plenty about plant botanicals and marine-based anti-aging ingredients. But the single best takeaway was something incredibly simple (and didn’t require breaking out a botany textbook). Store manager Sara LaBree told me that whenever you’re trying out a new skincare regimen you should start with the serum. The reason: Serums usually contain the highest quantities of active ingredients, so you’ll get the most bang for your buck and also be able to see how your skin reacts to the line. See? I knew there was a reason I am such a serum junkie.