> In an 18 month, placebo-controlled study with 40 subjects (age 51–84 years), researchers found that 90mg of curcumin twice a day improved outcomes of verbal,

> In an 18 month, placebo-controlled study with 40 subjects (age 51–84 years), researchers found that 90mg of curcumin twice a day improved outcomes of verbal, visual, and attention test scores by 28%. > Dr. Gary Small of the Longevity Center at the University of California and a team of 15 other scientists tested the compound on 40 adults aged between 51 and 84, all of whom had mild memory problems. > For a total of 18 months, the participants were randomized to one of two groups. One group took 90 milligrams of curcumin twice daily, while the other group took a placebo. The curcumin used in this study was a bioavailable form called Theracurmin, which the researchers describe as a “form of curcumin with increased intestinal endothelium penetrability” The highlight here, for me, is the "all of whom had mild memory problems". In pretty much everything I've seen about cognitive performance improvement, "fixing a problem" is way easier than improving performance. I wouldn't expect a 30% boost for patients that don't have mild memory problems.