Niacin vs. Niacinamide (Nicotinamide)


So I’m using a Multivitamin that appeared to give me a Niacin intake of 50mg/day, which is above the UL of 35mg/day. I was wondering why that would be the case when I checked the label again and noticed that it said “low flush” “Niacinamide”.

I checked into this and determined that Niacinamide was different than Niacin in terms of toxicity, but functionally had the same effects, and is commonly used as a substitute for Niacin due to its higher tolerance levels, which appear to be 3,000mg / day according to this source. This source also seems to confirm these findings, and links to several publications as well.

I hope this information will be useful to those who are attempting to figure out Niacin! :slight_smile: I’m glad I know about this now.


"Tolerable upper intake levels (UL) for adult men and women is considered to be 35 mg/day by the Dietary Reference Intake system to avoid flushing. "

Toxcity only really kicks in when you get up to 2g per day:


That’s good to know @dualhammers - thank you!