I would like to thank Gordon Wardlaw for reading and giving feedback on every chapter, and Elizabeth Joseph for a great deal of assistance with the reference aspects of the book preparation. I would also like to thank Emily Dy for help with references in the chapter on iron. In addition, I appreciate the help of ach of the following for comments on individual subjects: Michael Bergeron, Priscilla Clarkson, Steve Abrams, Connie Weaver, Greg Miller, and Greg Wiet. I also appreciate my wife, Janet, and children, David, Daniel, and Lisa, for allowing me the enormous amount of time it took to complete this writing. Finally, I want to express great appreciation to Stacey Bell for having the original concept for the book and helping me get it off the ground. I endeavored to present the issues in this book as honestly as I could, without trying to make any product supplier look better or worse than reality dictated. Even so, I do want to note the companies that have supported parts of my own mineral research: Albion Laboratories, Nutrition21, Glanbia, and Purac of America.