What are the best books about overall health, nutrition, vitamins and supplements?

Many good ones. Hard to say which are "best" but some great ones include The Encyclopedia of Natural Medicine and The Encyclopedia of Nutritional Supplements, both by Michael Murray, Staying Health with Nutrition by Elson Haas, Prescription for Nutritional Healing by Phyllis Balch, Total Wellness by Joseph Pizzorno, The Four Pillars of Healing by Leo Galland and Optimal Wellness by Ralph Golan. Enjoy!