I've been taking alpha lipoic for years, also CLA Tonalin besides the ordinary multi & omega and last year or two years ago I added b complex.
Pretty much anything that's supposed to be good for the brain, having watched my mother's deteriorate so horribly. Hope I'm not hurting myself with this stuff. For a while major doses of vitamin E was being touted by science as an Alzheimer's preventative, so mom took it, but after she died, science decided, ooops, actually major dosing is worse for you.
All you can do is go with what seems to be the best knowledge at the time, I suppose.
Per Blackbeltguy's post I just checked out http://en.wikipedia.org/wiki/Acetylcarnitine
"ALCAR has the ability to cross the blood-brain barrier and get to the brain blood circulation, where it acts as a powerful antioxidant, which helps in prevention of the brain cells' deterioration. Its supplementation has been shown to be neuroprotective
Will study that further and check with an aging studies professor from a class I took last year who specializes in the deterioration of the brain.