-- How much of which B vitamins do you need?
A. Everyone is different, so test your homocystein level first.  Maybe you are O.K. now.  Considering that over 50% of Americans are deficient in the nutrients needed it is not likely that you are different, but maybe.
B. In general, the "shotgun approach" would be to take the following daily, in approximate descending order of importance:

These are the 5 "essentials" for fighting known AD risk factors:

  Folic Acid (B9)    800 - 2000 mcg
  B-12                 100 - 800 mcg
  B-6                    25 - 100 mg
  B-2 (riboflavin)    25 - 100 mg
  Betaine (B-14)     25 - 100 mg

And these are the "importants", as co-factors for the above and for general health:

  Vitamin C  1,000 mg (500 mg twice daily)
  Vitamin D  1200 I.U. (30 mcg) (when not getting adequate sunshine)
  Vitamin E  200I.U. (mixed tocopherols, NOT just d-alpha,
                  taken with your "fattiest" meal of the day)
  Pantethine (B-5)       25 - 200
  Vitamin B-1 (thiamin) 25-100 mg
  Vitamin B-3 (niacin)   59-600 mg 

  Zinc          10 - 30 mg (Max. 40mg)
  Calcium      1.2 grams
  Magnesium 500 to 1000 mg
  Selenium    200 mcg (Max. 800mcg)

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