If you’re anything like me, you’ve spent way too much time (and money) trying to grow back overplucked brows or make your lashes look fuller without extensions. But did you know castor oil can regrow both? It’s one of those old-school beauty secrets that’s made a serious comeback—and for good reason. I recently started using castor oil on my skin for facial massage and miraculously noticed the incredible effect it was having on my eyebrows and lashes. I couldn’t believe how quickly they were filling in and getting fuller. And while I’m still penciling my brows, I now have to do a lot less of it and they overall look…