Hi Peter, thank you for your review of Qualia Senolytic. Yes, the nicotinic acid (niacin) form of vitamin B3 can cause flushing when taken in amounts substantially more than the daily value (DV) amount. Qualia NAD+ contains nicotinic acid, but in an amount below the level where flushing has occurred in studies.  The other common form of vitamin B3, niacinamide, does not cause flushing. NIAGEN® Nicotinamide Riboside, a next generation vitamin B3, also does not cause flushing. A very small number of people might experience heat or redness in the skin or a sense of flushing. If it’s uncomfortable, discontinue use for a day or two and start again at a lower dose. For most people who experience this it will stop within a couple days. We do see that you reached out to our Customer Support team, so you are all set!