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Vinpocetine is an alkaloid that promotes cognitive function. [1,2,3] Vinpocetine has a poor bioavailability of 6.2-6.7% in humans, but consuming it with food may help to increase absorption. 
Benefits of Vinpocetine 99% vs Vinpocetine 10%
Vinpocetine 99% means that it is of 99% purity, containing no filler.
Taking a vinpocetine supplement can promote cognition.* One study found that vinpocetine enhances acute memory formation and reduces reaction time.  Besides enhancing memory and reducing reaction time, vinpocetine also helps support cognitive function.* A study found that when consumed at 30mg for 90 days, vinpocetine enhancedÂ cognition, especially in the elderly. Â Another study conducted on the elderly found that vinpocetine supplementation enhancedÂ their ability to speak and form words.  It is thought that these benefits are the result of an increased accumulation of cyclic guanosine monophosphate (cGMP), by way of phosphodiesterase 1 (PDE1) inhibition.
The recommended dosage is 5mg thrice daily with food.