BBC NEWS | Health | Vitamin may ward off Alzheimer'sThey found that those with the lowest food intake of niacin - around 12.6mg a day - were 80% more likely to be diagnosed with Alzheimer's than those with the highest intake - around 22.4mg a day.
An 80% risk reduction is worth something, but this study looked like a fishing expedition. They may well have come across a chance and erroneous correlation. 22.4 mg of Niacin is a lot, I think the average multivitamin only has 15 mg.
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