Ginkgo Biloba is one of the oldest living tree species and its extracts have been used most widely for the treatment of memory loss and dementia (Reference 1). A 20-year study on the cognitive function of elderly patients, published in PLoS in 2013 by Amieva, et. al., demonstrated the utility of Ginkgo Biloba in cognitive memory retention (Reference 2). The World Federation of Societies of Biological Psychiatry (WFSBP) recommends 240 mg per day of Ginkgo Biloba (Reference 5).
In a McGill University study conducted in 2014, the 240 mg per day dosage was confirmed when a test population administered 240 mg daily demonstrated an overall better effect on cognition than those administered lower doses (Reference 3) . Another 2014 study published in the Journal of Geriatric Psychiatry confirmed the effectiveness of a dose of 240 mg per day with more pronounced cognitive abilities in people taking Ginkgo Biloba than those taking a placebo (Reference 4) . All studies taken together, as well as the guidelines from the WFSBP suggest that a dose of 240 mg per day is necessary in order to observe clinically significant effects on memory (Reference 3, 4, 5).