The basic answer is no.  The Alzheimer's Association's page on supplements for Alzheimer's disease has not been updated in years.

http://www.alz.org/alzheimers_disease_alternative_treatments.asp

I was told recently by one foundation that the Alzheimer's Association is revisiting this topic. I really hope that this is true.  There is substantial evidence that a number of antioxidants including certain essential oils via aromatherapy, panax ginseng (Korean red ginseng and heat processed ginseng), and medicinal marijuana can be used to effectively treat Alzheimer's disease.