2 parts didn't work so now ther will be 3 parts. 
 - Steve N

Vitamin B3. 
Vitamin B3 acts on the tau protein.The Vitamin B3 study was performed on rats. 
UC Irvine is currently seeking volunteers for a human clinical trial. Here is a 
link to an abstract of the Vitamin B3 study:

Nicotinamide Restores Cognition in Alzheimer's Disease …The Journal of 
Neuroscience, November 5, 2008
http://www.jneurosci.org/cgi/content/abstract/28/45/11500

Here is a link to the UC Irvine announcement on the study they performed:

Vitamin B3 reduces Alzheimer's symptoms, lesions
http://today.uci.edu/iframe.php?p=/news/release_detail_iframe.asp?key=1849

Here are a couple of good articles on the UC Irvine study:

High Doses of Vitamins Fight Alzheimer's Disease
http://orthomolecular.org/resources/omns/v04n25.shtml

Alzheimer’s Disease and a Possible Cure
http://dickshealthdebate.blogspot.com/2009/05/alzheimers-disease-and-possible-cure.html

High dose vitamin B3 has also been found beneficial in some cases of diabetes 
and schizophrenia:

Another Anecdote of Schizophrenia
http://www.doctoryourself.com/hoffer_anecdote.html

Curcumin. 
Curcumin acts on the amyloid accumulation. Because of this I think it makes a 
complementary treatment with B3. Additionally, curcumin has many other health 
benefits including helping to prevent some types of cancers. Curcumin is found 
naturally in the spice turmeric which generally contains 3 to 5% curcumin. You 
can buy standardized extracts of curcumin, usually 90 – 95% curcumin. But I 
prefer to make my own turmeric tinctures and just use enough to get the 
necessary amount of curcumin. I also believe that whole herb tinctures that 
contain all the plant substances are generally better than isolated 
extracts.Because the body metabolizes curcumin so quickly, bioavailability is a 
problem with curcumin. (See: Bioavailability of Curcumin: Problems and Promises
http://mccormickscienceinstitute.org/assets/Mol%20Pharm.%202007%20Nov_Dec;4(6)807-18.pdf) 

But there are some products out there that give improved bioavailability.As far 
as I know, there are 3 forms of improved bioavailability curcuman available 
commercially:     

1. Curcuman with Bioperene (aka pepperine)  (A number of sources are 
available)    
2. Biocurcumax - Curcuman blended with turmeric oil (an essential oil).       
3. Lipisomal encapsulated curcuman   A number of sources are available. 

Biocurcumax is more more bioavailable than curcuman with Bioperene and lasts 
roughly twice as long in  the bloodstream (8 hrs).I haven't seen data on 
Lipisomal encapsulated curcuman but my guess is that it is equivalent to 
Biocurcumax.You can mix freshly ground black pepper with curcuman (or turmeric) 
to get something similar to Curcuman with Bioperene.You can mix curcuman with 
turmeric oil to get something similar to Biocurcumax
I use a homemade combination of pepperine, turmeric oil and DMSO combined with 
a turmeric tincture.Here is a link to the curcumin study:

Curcumin Inhibits Formation of Amyloid β Oligomers and Fibrils, Binds Plaques, 
and Reduces Amyloid in Vivo
http://www.jbc.org/content/280/7/5892.full