What Liv Tyler Tells Us: "Hair of the dog always works. A nice breakfast is also very important." What the Expert Says: Skip the alcohol. "It just delays the inevitable," says physician Frank Lipman, founder of NYC’s ElevenEleven Wellness Center. Breakfast, however, is key: "Eggs contain cysteine to break down toxins and make you feel less sluggish." At the very least, take a natural energy stimulant like CocoaWell ($30, Whole Foods).