Just so you know..... I use the University of Maryland's database for quick answers. I know many of the answers already, but many do not like the detailed medical/chemical explanations other sites hold.

The links I gave for January were adequate for her questions.

People who want MORE are always able to search further. I have posted the Linus Pauling links for all supplements all over these boards, and sometimes it is not necessary for all posts. You should go there are read them when you have time. It is a huge database.

Her doctor should be aware of the Niacin/blood sugar thing. It is well known IMO in the medical area. It is on the INSERT for Niaspan even, so it would be in his PDR.

There is never going to be definitive vitamin information because the data changes constantly. The simplistic rules of the past are no longer valid, when the initial vitamin research was done. Much of that information is very old now. And there is no one answer for every person either because we are finding huge genetic differences in the metabolism of many common vitamins. Folic acid and B12 are prime examples.

When you have time research Dr. Bruce Ames' papers on PubMed, as he believes that abberant metabolism of all B vits is responsible for many human illnesses and aging changes.

I have read much of the nutrient information over the last decade, and I know how patients present and react to things.
I've learned where the useful information is found and where to look for reliable things that are understandable for most readers here.

I am sorry you don't understand my links. There there little I can do about that. Niacinamide and nicotinic acid are different and the old studies on niacinamide didn't pan out well. Niaspan is nicotinic acid and has always been implicated in raising blood sugar readings. In normals it may approach diabetes, and in diabetics it might be more significant than that.