Amazon.com description: Product Description: This inaugural edition of the NutriSearch Comparative Guide to Nutritional Supplements for the AmericasTM provides a compilation of scientifically based information on nutritional supplementation compiled from the 3rd, 4th, and 5th editions of our comparative guides. The central roles of oxidative stress and inflammation in the onset of chronic degenerative disease are explained. The preventive roles of dietary antioxidants are discussed. The fundamental question of why we need to supplement is answered. The importance of supplementation with two ancient antioxidants, vitamin D and iodine, is highlighted. With exhaustive market research on dietary supplements available throughout the Americas, the guide offers a comprehensive single-point reference for evaluating and comparing nutritional supplements within diverse international markets: 1500 products from Canada, Colombia, Mexico, and the United States evaluated. 18 Health Support criteria enhanced to accommodate new research findings. Highest rated products from leading manufacturers by market share for each country graphically displayed. Best of the Best product in each country revealed. See how your nutritional supplements compare with others. Learn about the consequences of global nutrient depletion of our foods. Read about the remarkable protective powers afforded by natural health products.