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«This suggests that the forms of choline that could theoretically work are more effective than than ones that don’t – or that people are aware of the chemical properties of their forms of choline and adjusting their placebo effects accordingly.» - http://slatestarcodex.com/2014/02/16/nootropics-survey-result...
From Nootropic survey results; tl;dr: effects of everything seem rather weak. ‎- 9000