 who said they were concerned about their memory. The researchers randomly assigned some of them to take capsules with 10 milligrams of Prevagen daily for 90 days, while the rest were given placebo capsules that had only white flour in them. All the participants then took nine computerized tests over the course of the study to gauge their thinking-related skills. By the end of the study, the researchers said that some of the people who took Prevagen showed slight improvement