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Indoor air pollution in sealed office buildings can lead to mysterious symptoms, called sick building syndrome, which disappear a few hours or days after leaving the building. Symptoms can include feeling tired or lethargic, nasal congestion or a runny nose, dry or itchy eyes, dry skin, dry throat, headache, flu-like symptoms, or difficulty breathing. Photocopy machines, laser printers, and other office machines are among the pollution culprits. However, a study of 350 people, published in the journal Vitamin & Minerals, found that a daily multivitamin-which enhances immunity by correcting deficiencies in essential vitamins and trace minerals-can reduce or alleviate symptoms.