Linus Pauling Lectures on Vitamin C and Heart Disease 
Two-time Nobel laureate and the world's foremost vitamin C proponent. An article about the man and the vitamin.
http://www.lbl.gov/Science-Articles/Archive/pauling-and-vitamin-c.htmlAn FDA Guide to Dietary Supplements 
Article explains requirements for labeling, what constitutes a supplement, monitoring for safety, understanding manufacturers claims, fraudulent and quality products, and how to report harmful effects or illness.
http://www.fda.gov/fdac/features/1998/598_guid.html
Multivitamin/Mineral Supplements and Chronic Disease Prevention 
Draft statement discusses current use of supplements, outcomes of chronic disease prevention, and research recommendations. Includes preliminary findings by specific vitamin or mineral.
http://consensus.nih.gov/2006/MVMFINAL080106.pdf