As one choir member to another, I did not know that information myself until quite recently. One of my oleandersoup forum members on Yahoo told me that she was taking products that included both of the above mentioned forms of niacin and she wondered if that was safe - and I had to do a little research to find the answer. What I learned was that it appeared to be not only safe in most instance, but perhaps beneficial. It is by means of such question and the necessity of doing my homework that I become a bit wiser as time goes by and hopefully remember more than I forget - learning being a never ending process.
Speaking of forgetting and such (and I note your repartee here with Sara), as an interesting aside, there was a study last year at I believe Caltech Berkley, where they used high doses of niacinamide with 100% success in reversing the rodent equivalent of Alzheimer's. Naturally, the researchers cautioned against anyone trying to do the same thing with humans and of the dangers of taking supplements - despite the fact that niacin and niacinamide have a virtual 100% safety record. I believe that the proper interpretation was to not take any such supplements until they can produce a patentable version to market.