I read Earl Mindell's "Vitamin Bible" in the early 1980's and haven't stopped.
Cool! He's got a new version: Earl Mindell's New Vitamin Bible (Mass Market Paperback, 2011)
I read Adelle Davis' study of supplements, Let's Get Well: A Practical Guide to Renewed Health Through Nutrition, in the early 70s and wow, what a great help it has been. It's also revised, and she wrote several other great guides to fitness and nutritution.