“Creatine Cognition Meta-Analysis”, 2013-09-06 (; backlinks; similar):
Does creatine increase cognitive performance? Maybe for vegetarians but probably not.
I attempt to meta-analyze conflicting studies about the cognitive benefits of creatine supplementation. The wide variety of psychological measures by uniformly small studies hampers any aggregation.
3 studies measured IQ and turn in a positive result, but suggestive of vegetarianism causing half the benefit. Discussions indicate that publication bias is at work.
Given the variety of measures, small sample sizes, publication bias, possible moderators, and small-study biases, any future creatine studies should use the most standard measures of cognitive function like RAPM in a well-powered pre-registered experiment.