French Long-term study shows Vitamins (including Vitamin C) improves Long-term memory

In the 1994–2002 French study participants were 45 to 60 years old, researchers split them randomly into two groups. Half of them took a daily supplement that included vitamins C and E, selenium, zinc, and beta-carotene for eight years.Participants received:

• daily vitamin C (120 mg),
• β-carotene (6 mg),
• vitamin E (30 mg),
• selenium (100 μg), and
• zinc (20 mg).

The participants that took the vitamins beat their peers on one test of long-term memory in which participants had to recall words in different categories. 
The difference was at least enough to be statistically significant.

The dose of vitamin C is actually very small. 
Many (like me) people take one hundred times that amount.
All this goes to illustrate the difficulty in establishing the optimal dose for the various vitamins.
It is also hard to motivate people to take care of health situations that will occur 8 years from now.
I also want to point out the tiny cost of keeping your memory healthy compared to the benefit.
The cost of the vitamins used  in this study amounts to pennies a day. 
Do you think that the people with the better memory would rather have the good brain or the eight years of pennies a day?
The cost of a week of assisted living can easily make up for whatever was spent on vitamins.

More information here