Earl Mindell, R.Ph., Ph.D. is an internationally recognized expert on natural health and nutrition and the author of more than 30 books, including the international bestseller The Vitamin Bible, as well as The Herb Bible, The Supplement Bible, and The Allergy Bible. He is a popular lecturer and well-known authority on nutrients and natural health. Virginia Hopkins, M.A. has written and co-authored more than 30 books on alternative health and nutrition, including the bestselling What Your Doctor May Not Tell You About Premenopause and What Your Doctor May Not Tell You About Menopause (with John Lee, M.D.). She is the editor of the Virginia Hopkins Health Watch, a widely read e-mail newsletter. Donald R. Yance Jr., CN, MH, RH (AHG), is a clinical master herbalist and certified nutritionist. He is the founder of the Mederi Centre for Natural Healing in Ashland, Oregon, the president and formulator of Natura Health Products, and founder and president of the Mederi Foundation. He lives in Ashland, Oregon.