I can use myself as an example: I have crohn's disease and I can take doses of 50000UI for some weeks, then 4000UI daily and after a year have my Vitamin D resu

I can use myself as an example: I have crohn's disease and I can take doses of 50000UI for some weeks, then 4000UI daily and after a year have my Vitamin D results as low as 20ng/ml.