We’ve all been there. You can’t bring yourself to throw out that half-used and expensive face serum you bought a few years ago. Or maybe you have an old moisturizer sitting on your shelf that you can’t seem to toss. But hanging onto skincare products that have outlived their prime is doing no favors for your skin. In some circumstances, using old products can even aggravate it. The problem is that most people aren’t sure when their product...

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...