In the summer of 95 I took large amount of vitamine B3,
2 gram hexanincite per day. I quit when spots started to
apear in my vision. It also feels like my cemistry somehove
has changed, and hasn't recovered after 6 months.
I've heard that B3 can cause damage to the blood
Now I'm wondering what the blood brain barrier is and
any theory on if it might be damaged ?