I used Source naturals Vinpocetine a few years ago and ran out but forgot to reorder for some 12 months. I noticed I wasn't as sharp as normal during this time..I reordered some again just recently and since using again its as if I have a fog lifted from my brain. These tablets definitely work, so I won't be running out of them again. Thanks I Herb for your brilliant service and great prices.
Learned about vinpocetine in Hyla Cass's book, Natural Highs; this is said to increase cerebral circulation. Takes a few doses to feel the effect, but it definitely works for me. This seems to be a supplement best used continuously over a long period of time for best results, but have heard other anecdotal evidence that it helps sharpen the mind and even has sharpened vision for some. I find my mind is more focused since taking & I can think more quickly on my feet. Research first if you take blood thinners.