I’m noticing something interesting while creating my Toxicity Alert System in my spreadsheet. I started noticing this when I plugged in my values for Niacin, of which I obtain 100% of from one multivitamin, and they were at 250% the recommended value, which is 20mg.
This source and this source both indicate that the UL for Niacin is 35mg / day. However, the Wikipedia article, as well as this source indicate that adverse effects only start to occur at +1.5g / day.
If adverse effects only start to occur at 1.5g or more, then why is the UL only 35mg? Is there an error somewhere in one or more of the sources? I find it odd that my multivitamin would by default contain what these sources are confirming is a level of Niacin well above the UL.
Anyone else with additional information or knowledge in this regard who could provide their input would be very appreciated.