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The nutrient arginine can help ward off infections

Call 911 in an emergency, and the dispatcher urgently asks, "Where are you?"

When a virus attacks, your immune system wants the same info - which of the trillions of cells in your body is in trouble? Enter arginine, a nutrient that knows how to yell "SOS."

This amino acid hangs a "Help! Over here!" sign on newly infected cells. That attracts virus fighters with the firepower to knock...

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