Is your bathroom cabinet jam-packed full of different kinds of serums? You’re not alone. Most of us know that serums work wonders for the skin. But with so much variety out there, it’s hard to know which type is best for your skin. Likewise, it seems like serums are full of contradictions. They’re deeply moisturizing, but they shouldn’t replace your moisturizer. They can be oily, but they aren’t facial oils. Which so much con...