Natural sources of vitamin D are not hard to come by!!! cholecalciferol, which is also known as vitamin D3, is used as a rodenticide. It works by causing a life-threateningly high calcium and phosphorus level in the body, leading to kidney failure, cardiovascular problems, and tissue mineralization. This can also be toxic to dogs, cats, and humans. Here’s a more detailed explanation: How it works: Cholecalciferol, when ingested by rodents (or other animals), increases the absorption of calcium a