Let’s talk about something that doesn’t always get the spotlight it deserves: haircare. And not just any haircare — Korean haircare. Sure, we all know Korean skincare is basically the holy grail, but trust me, K-beauty has been holding out on us when it comes to hair. Until now. Because drumroll please : Dr. Groot , Korea’s No. 1 hair thickening brand is officially making its grand entrance into Costco stores nationwide this month. I’m not just hyped because it’s new. I’m hyped because I’ve