http://34reqsy6tqou6avwrkm23s4mpkrwz3drtq2e5yr7sywi76h7plnaahad.onion/articles/wikipedia.xhtml
Fortunately, Wikipedia comes to the rescue and beautifully refutes it in the same sentence: while other research concludes that, in healthy adults, sustained intake of more than 50,000 IU/day (1250 μg) can produce overt toxicity after several months and can increase serum 25-hydroxyvitamin D levels to 150 ng/mL and greater.[24][158] Amazing. Obviously, if 50000 over many months is needed to produce overt toxicity , then 4000 (over 10 times less) must be perfectly safe.