Excessive Vitamin D3 can cause hypercalcemia. While nothing conclusive has been determined at this time, veterinarians are reporting a possible link between a particular Blue Buffalo formula and a number of dogs coming down with hypercalcemia. Hypercalcemia is an excess of calcium in the blood, which can lead to the calcification of organs. In 2006, some Royal Canin prescription diets were formulated with too much synthetic Vitamin D3 causing hypercalcemia, which led to the death of a number of dogs and cats who were fed the food.
Nature's Logic is the only line of commercial dry food in the world that does not use synthetic vitamins, including Vitamin D3. While other dry or canned pet foods add up to 26 chemically-synthesized vitamins and minerals to meet AAFCO nutrient requirements, Nature's Logic does it only with food. We use only natural foods to safely derive all essential nutrients. This is the natural, best, and safest way for humans and pets to get their needed nutrients. For more information on Nature's Logic foods, please visit http://www.natureslogic.com/.