I’ve always been a huge fan of serums but, admittedly, I’ve been rather agnostic when it comes to what types I actually put on my face. I’ve used ones with green tea extracts, some that smell of CBD, some that are goopy, and others that are watery — but mostly I love serums of all stripes because they act as a very hydrating primer for whatever moisturizer I put on afterward. But recently, I was specifically turned onto vitamin C serums — which encourage brighter, smoother, and younger-looking skin with their antioxidant and collagen-boosting properties — care of Clinical Skin, a skincare line that uses clinical research to create “medical-grade formulas with spa-like luxury.” I’ll tell it to you straight: This stuff is very good — and it may be why it has a steep $120 price tag.