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Alertness is an aspect of wakefulness with hints of attention, and is the ability to interpret and maintain attention on different targets. Supplements that increase alertness tend to be anti-sleep or stimulatory agents.
This page is regularly updated, to include the most recently available clinical trial evidence.
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"Alertness," Examine.com, published on 5 July 2013, last updated on 29 April 2017, https://examine.com/topics/alertness/