Guide book for Herbs and Vitamins

Can you recommend a reputable book or guide for vitamins and herbs and their uses? I am interested in information for teens, middle age men and women.

"Encyclopedia of Natural Healing" by Siegfried Gursche, Medical editor Zoltan Rona, MD, is an excellent new book that describes natural therapies, including Herbal Medicine and Nutritional supplements, and treatments for over 300 conditions. It is available in health food stores and from the publisher, Alive Publishing Inc in Canada, phone (800) 663-6580 or Natural Life Publishing, Inc. in the U.S., phone (800)663-6513.