Niacin

Niacin - The Linus Pauling Institute
Professional review of the functions, food sources, deficiency diseases, drug interactions, and recommened daily intakes of niacin.
http://lpi.oregonstate.edu/infocenter/vitamins/niacin/index.html

Zest for Life: Vitamin B3-Niacin
Brief look at the vitamin with basic functions, good food sources, and deficiency signs.
http://www.anyvitamins.com/vitamin-b3-niacin-info.htm