you should test your serum levels and go from there. 50k IUs a day is a lot if your blood level of d3 is already 50 nmol/l or higher, it's probably the right do

you should test your serum levels and go from there. 50k IUs a day is a lot if your blood level of d3 is already 50 nmol/l or higher, it's probably the right dose if your level is 19 nmol/l and you are being supervised by a doctor to recheck on regular intervals to back the dosage off once you get the serum level close to where you want it to be. Me personally any more than 5000 IUs a day I would be checking my levels at least once a year just to make sure I'm not slowly poisoning myself (I'm an obese guy who has tested low before that lives in the northern hemisphere and likes to use computers all day and not go outside much. If I was smaller/lived closer to equator/spent more time outside I would want to test at least yearly over 4000 IUs a day, but this is just my personal opinion none of this is medical advice).