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Vinpocetine is a periwinkle plant extract that improves mental function by increasing blood flow to the brain and by increasing ATP (energy) production in the brain.

Articles
Vinpocetine – cerebral enhancer and neuroprotector
   
Cerebral blood flow
Increases cerebral blood flow
  May improve cerebral blood flow
  Increases regional cerebral blood flow
  In the treatment of cerebrovascular disorders
  Study of patients with cerebrovascular disorders
  Has a protective effect against cerebral ischemia
  Dose of 5mg caused increased cerebral blood flow
  Is indicated in ischemic disorders of cerebral circulation
  Increases cerebral blood flow in stroke patients
  Redistributes cerebral blood flow in post-stroke patients
   
Dememtia research
Use in dementia
  Enhances oxygen release in vascular dementia
  Treatment for vascular senile cerebral dysfunction
   
Memory research
Significantly improved memory
  Significantly improved short-term memory
  Was associated with improvement in short-term memory
   
Misc research
Safety
  Safety and efficacy
  Mechanism of action
  As a free radical scavenger
  Improved visual acuity in 88% of subjects
  Might increase adaptation to hypoxia
  Significantly reduced neuronal cell loss
  Caused significant improvement in vascular diseases
  Enhances the glycolytic glucose breakdown in CNS
  Improved 87% of patients with CNS disorders
   
Stroke research
Treatment in stroke
  Cerebral effects on stroke patients
  Improved red blood cell deformability in stroke patients
  Increases cerebral blood flow in stroke patients
  Redistributes cerebral blood flow in post-stroke patients