One of the most worrisome aspects of aging is the fear of losing one's mind and memory. We are learning that the incidence of dementia or Alzheimer's disease can be reduced with life long healthy eating patterns and also by the use of certain supplements. A study recently completed in Germany found alpha lipoic acid, a potent antioxidant, was able to slow the progression of Alzheimer's disease. Patients with Alzheimer's disease received 600 mg of alpha lipoic acid daily for several years. The researchers concluded that the rate of progression of the disease was slower in comparison to normal progression of Alzheimer's disease. 
Comments: I prefer using lower amounts of alpha lipoic acid in a range of 10 to 50 mg of the more potent R alpha lipoic acid a few times a week. There are many supplements that could help mental decline.