A dietary supplement used by many athletes to boost muscle power can also increase brain power, at least in vegetarians. New research shows that non-meat eaters taking the supplement, called creatine, perform better in various memory tests than those taking a placebo. However, it is not yet clear if the benefits would apply to meat-eaters, as they already gain creatine from their diet. It is also uncertain whether the effects persist for as long as people continue taking the supplement, or whether it diminishes after a few months. NewScientist.com