Danish EPA | New type of rat poison approved
The poison is based on the active substance cholecalciferol, also known as vitamin D3.
Cholecalciferol has the same benefit as the anticoagulants that they only work after a few days, therefore the rats reach a lethal dose before getting symptoms of intoxication. Rats are careful animals, so if within 7 hours they get bad food, they will never eat it again.
Source: mst.dk (Automatically translated from Danish)