Many of us take meticulous care of the skin on our face using a deliberate assortment of serums, essences, moisturizers, and sun protection. But what about the skin on the rest of your body? Lately, we’ve seen more and more body formulas include ingredients that were once mostly found in products meant for your face. In that same vein, it’s (finally) time to pay closer attention to your scalp, which is also skin, after all! And the healthier it is, the likelier your hair is to look and feel its best, too. Whether to soothe an irritated scalp, maintain its overall health, address flakes, or strengthen your strands, add one of these 9 scalp serums to your haircare regimen today. No rinsing required!