83 () posted 3 years ago by pkvi 3 years ago by pkvi +88 / -5 79 comments share 79 comments share save hide report block hide replies
A percentage of the population are unable to process folic acid and need to take B9 in the naturally occurring format, folate. It's a genetic mutation. For these people, folic acid is a mild poison.
https://www.amymyersmd.com/article/mthfr-mutation/
Sadly, most people don't know if they have this problem, and will not know why they are unwell.