The Mystery of Tylenol: We Really Don’t Know How it Works [Science Video]

Acetaminophen, the active ingredient in Tylenol, is one of the most popular pain relievers in the world, selling more than 27 billion doses in 2009 alone. It can reduce fevers, eliminate aches and pains and relieve cough and cold symptoms. But how does it work? The truth is, no one knows exactly. This week, Reactions examines the theories about the popular pill.


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