The Big Vitamin D Mistake (2017)

> A statistical error in the estimation of the recommended dietary allowance (RDA) for vitamin D was recently discovered; in a correct analysis of the data used by the Institute of Medicine, it was found that 8895 IU/d was needed for 97.5% of individuals to achieve values ≥50 nmol/L

Earlier discussion: https://news.ycombinator.com/item?id=15867918

Anecdotal, but worth sharing anyways: I read a comment on HN in 2018 from someone who mentioned a connection between migraine and vitamin D deficiency. I started taking vitamin D after that and my migraines have decreased from once every three weeks to about three times per year.