An observation of over 2,000 elderly people found an association between the amount of vitamin C in the blood and the volume of gray matter in the brain and with connections between the prefrontal cortex and other brain regions. Correlations were significant, but low, and the data are very noisy.
Summary: https://www.sciencealert.com/the-link-between-vitamin-c-and-brain-health-just-got-even-clearer
Original paper: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0348504









