One of the most unique products out there as a hybrid facial oil (not essential oils!) with mica for makeup. The mica does have me a little conflicted, because I do not know how Glossier sources their mica. With that said, as a makeup product I get compliments. I use it all over and sometimes add a little more after my makeup is done as a highlighter. As a skincare product, it has so many good oils. Squalane, jojoba, and grapeseed just to name a few. I only use it at night if I'm not slugging. Also, I don't agree with this being in the "serum" category. As a facial oil, it should be used almost last, before sunscreen.