Hair of the dog or a big, greasy breakfast? Here are 5 scientific cures for hangovers. 1. An herbal extract called Dihydromyricetin, or DHM, is used as a hangover treatment in China, Korea and Japan. 2. Cysteine, an amino acid found in eggs, dairy, meat and oats, can help decrease hangover symptoms. 3. Electrolytes like sodium, potassium and magnesium can relieve headaches, fatigue and muscle pain. 4. Drinking water can help stave off the dehydration that worsens hangovers. 5. Exercise can generate feel-good endorphins, but be careful not to overdo it.