These 6 Supercharged Skin-Care Boosters Will Take Your Face Products to the Next Level

Many of us reach for vitamin supplements or juice-bar shots when our bodies are feeling run-down. Now, that same principle applies to skin, whether it's looking dull, breaking out, or overproducing oil. The new wave of concentrated elixirs are formulated with potent doses of key nutrients--everything from skin-revitalizing vitamin D to energizing caffeine--and can be mixed in to creams, serums, and masks to deliver a supercharged custom fix any time you need it. Here, the six best new add-on pro...