What's that? There are a bunch of different B vitamins.
I forget which ones cause problems. My brother-in-law first told me this (he’s a doctor, and also researches these kinds of issues — unlike most doctors!), but I forget the details. His rule of thumb was that if you don’t get any side effects, don’t worry about it. But apparently some people are just much more sensitive than others.
Personally, I would get chronic nausea, coupled with lethargy and other mild symptoms. Nothing too major, but enough to make me feel not quite right (and also easy to blame on other things). Plus, I had elevated liver enzyme levels that have since gone away.
He said its not at all uncommon, and usually not serious. Just common sense. I switched to a different multi-vitamin and everything is fine.
Going back to the article, it does make me wonder if they test for vitamin b sensitivity (if there is such a test), before making these blanket statements.
B-Complex 100