"I love hair products that are designed to make my life easier so the Kérastase's Nutritive 8-Hour Magic Night Serum ($55) really spoke to me. The night serum is formulated with Vitamin B and Iris Root Extract to revitalize and nourish strands for a smoother, healthier look while you sleep. By morning, the residue completely disappears — no washing required." — Jessica Harrington, assistant editor, Makeup.com and Skincare.com