For those who are disinclined to wait for the results to be known, there is an extract of lesser periwinkle called vinpocitene that you might want to look at.

From Wikipedia-
"ester of apovincamine"),[1] an extract from the periwinkle plant.

Vinpocetine is reported to have cerebral blood-flow enhancing[2] and neuroprotective effects,[3] and is used as a drug in Eastern Europe for the treatment of cerebrovascular disorders and age-related memory impairment.[4]

Vinpocetine is widely marketed as a supplement for vasodilation and as a nootropic for the improvement of memory. In other words, Vinpocetine may help support brain functions such as concentration and memory by activating cerebral metabolism. A small subset of users report uncomfortable, adverse reactions to vinpocetine. A low initial dosage is ordinarily recommended.

Vinpocetine has been identified as a potent anti-inflammatory agent that might have a potential role in the treatment of Parkinson's disease and Alzheimer's disease.[5][6]"

-Rick