I take the Life Extension Mix caplets with extra niacin, but like you at the reduced dosage of only 3 per day. Recommended is NINE! That’s a bit much, I think. And they reformulate the mix every year or so as new discoveries are made. I think they also now have a “Two-A-Day” multivitamin for those who don’t want so many pills.
You can find out lots at the Life Extension website. Just go to the home page from the link I posted down there for the Senolytic Activator.