I use Vinpocetine and also recommend it to friends and family for dementia. A sibling is taking it. She was getting early signs of dementia and the supplement is definitely helping to reverse that.
It is also beneficial for Parkinson's Disease, anxiety and depression at less than 31 mg per day.
One side effect I have seen with vinpocetine is that it thins the blood and can be a problem for people who are already on a blood thinner or who take other supplements that have blood thinning effects such as vitamin E and fish oil.