Long-term use of standardised Ginkgo biloba extract for the prevention of Alzheimer's disease (GuidAge): a randomised placebo-controlled trial.
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Link to full study
http://www.ncbi.nlm.nih.gov/pubmed/22959217
Conclusion of this study
Long-term use of standardised ginkgo biloba extract in this trial did not reduce the risk of progression to Alzheimer's disease compared with placebo.
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