Taking the supplement ginkgo biloba had no clear-cut benefit on the risk of developing memory problems, according to a new study. The three-year study involved 118 people age 85 and older with no memory problems. Half of the participants took ginkgo biloba extract three times a day and half took a placebo. During the study, 21 people developed mild memory problems, or questionable dementia. Although there was a trend favoring ginkgo, the difference between those who took gingko versus the placebo was not statistically significant.