You’re probably thinking of IUs rather than ug but even then 50k is way too much:

“Doses below 10,000 IU/day are not usually associated with toxicity, whereas doses equal to or above 50,000 IU/day for several weeks or months are frequently associated with toxic side effects including documented hyperglycemia.”

https://en.wikipedia.org/wiki/Vitamin_D

50,000ug is 2,000,000 IUs, in other words way too much!