Vitamin B12 can slow down memory loss a study published earlier this year in the American Journal of Clinical Nutrition compared the use of lower and higher serum Vitamin B12 concentrations in ageing patients and found that those who had the higher dose performed better in memory tasks
(PubMed) McNeill G, Avenell A, Campbell MK, et al
Patients' mean age was 14 years old, approximately 55% were female, 67% were White, 26% were Black or African American, and 33% were Hispanic or Latino ethnicity
As good a clinical trial as you can get, thats number one
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