What Allison Williams Tells Us: "The smell of rosemary in my eye cream wakes me up. It’s pretty spectacular and helps diminish dark circles after a late night of partying." What the Expert Says: Though rosemary is a proven antioxidant, vitamin K constricts blood vessels, helping under-eye circles diminish faster, notes facialist Micheline Reboh of NYC’s Paul Labrecque Salon and Spa. Try Peter Thomas Roth’s Eye Rescue ($100, peterthomasroth.com).