Hey Nas,
From what I read, most advice in this forum suggests that you should not take the B3 vitamin regularly or it loses its efficacy.
There are a few guys here who had success with taking B1, B6 and B12 daily but I don't know how healthy taking them in high doses regularly is...
If you do take the B3, others have suggested to take it on an empty stomach, not eating 3 hours before, then having O an hour or so after. I take their advice...
100 mg may not be strong enough according to other posts, but everyone is different.
Keeping trying new things, I NEVER would have thought something as simple as a vitamin could help what has plagued my life with unbearable cognitive symptoms. Unfortunately I ignored this forum for years believing these suggestions were pointless... please keep trying new things, very few people have symptoms as bad as mine, I could barely go outside with POIS for 2 days...
All the best...