My father has been taking 325 mg of "no flush" niacin for 4 months. (I would like to see him taking more, but he takes a lot of medication and even getting in that one pill a day is a step in the right direction.)
I, and others, have noticed a lessening of his Alzheimer's/Dementia symptoms. He is less confused. He is sharper. As mentioned in another post, I just got back from a visit with him. We played cards. He played a spelling bee type game with my son. He would not have done these things a few months ago.
After my mother passed away four months ago, we expected my dad to decline steadily. He is doing so much better than we expected. He does have less stress now (watching your spouse die of Alzheimer's over the course of a couple of years is very stressful.) He is also getting regular exercise. Those and the niacin may all be contributing to his improved mental condition. Whatever it is, we are glad!
~Mama to Many~