Dr. Zoltan Rona is a graduate of McGill University Medical School and is a past president of The Canadian Holistic Medical Association. He is the author or co-author of 12 books on natural medicine. His latest book is Vitamin D: The Sunshine Vitamin. He has had a private medical practice in the Toronto area for the past 35 years. He currently writes regular articles for Reader’s Digest, Vitality magazine and for several web sites. www.tristarnaturals.com