I have a book all about vitamin C written by Andrew Saul, which he wrote with Steve Hickey, PhD. I also have one about niacin, which he wrote with Abram Hoffer, MD, PhD, and Harold D Foster, PhD. There has been some promising research into niacin's use for mental health issues such as schizophrenia. It seems that some people have an abnormal need for niacin that far exceeds what most people need.