What Ingredient in Dayquil Is Ineffective? Unpacking the Science
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4 min read
In September 2023, a U.S. Food and Drug Administration (FDA) advisory committee unanimously concluded that oral phenylephrine, a decongestant in many products, is ineffective [1.7.1, 1.7.2]. This article answers the key question: what ingredient in Dayquil is ineffective and why?
