Warning in Norway – 2,000 IU Vitamin D being sold (800 IU is their upper limit)
Nutragredients
Amazon sells 50,000 IU capsules – which the admin of VitaminDWiki takes every 4 days
One US scientist took 100,000 IU daily and got slight problems after 6 months -350 ng
NHS (UK) mistakenly says more than 1000 IU of vitamin D can be harmful – Dec 2013
Dosing error gave 12000 IU daily vitamin D to infant, but no indication of any problem – April 2012
Overview Toxicity of vitamin D has the following chart

Published Recommendations has the following

Note: Europe's lower limit appears to be higher than Norway's upper limit