Pharmaceutical Composition for Promoting Neurogenesis and Method of Utilizing Gastrodia Elata Extract or Adenosine Analog for Promoting Neurogenesis

A pharmaceutical composition for inhibiting senescence of brain neurons of a subject, the composition comprising:

• Gastrodia elata extract prepared by the steps of:
• extracting pieces of Gastrodia elata tubers with a 70% aqueous ethanol solution at 50° C. overnight to obtain an extract solution;
• concentrating and drying the extract solution to obtain a crude extract;
• eluting the crude extract through a macro-porous resin column first with water, followed by 50% ethanol, to obtain the Gastrodia elata extract.