evidence: Vitamin D3 is one of the most popular vitamins in the pharmacy these days. That’s because a lot of people are low in vitamin D. Vitamin D3 is often considered to be the best supplement to replenish low nutrient levels. But did you know that too much vitamin D3 can pose problems? Until we received this question, we had not realized vitamin D3 had been used as a mouse and rat poison! [...] Vitamin D3 as a Mouse and Rat Poison