ALCAR and ALA is awesome for it's mental functions, IMO...
Started my Grandma taking it, as she was beginning to display signs of dementia, and while supplementing with it, she showed vast improvement. Just can't get the stubborn old lady to take it consistently...
But for you man, Dsade's got it about right. You can take higher doses of the ALA for supposed glucose support, but I never found it to make any difference. Also, high doses of ALA do cause allergic reactions in some people, so just take care.