But a new Kyowa-funded study of 60 healthy women found a monthlong regime of daily doses of citicoline resulted in improved attention and fewer errors on a cognitive test compared with placebo, says co-author Deborah Yurgelun-Todd, a scientist at the Brain Institute at University of Utah in Salt Lake City, who is a paid consultant to Kyowa.

WSJ: An Energy Shot for the Brain

CNN's Susan Candiotti, Deborah Feyerick, Carol Cratty, Jake Tapper, Brian Todd, Pamela Brown and Kathleen Johnston contributed to this report.

CNN: 3 more detained in Boston attack

CNN's Susan Candiotti, Deborah Feyerick, Gloria Borger, Carol Cratty, Jake Tapper, Brian Todd, Pamela Brown and Kathleen Johnston contributed to this report.

CNN: Bomb suspect's buddies covered for him, feds say