30k does sound a bit crazy but maybe it works for parent. I was taking 4k IU during colder months of WFH and after a few months had to reduce it because I was g

30k does sound a bit crazy but maybe it works for parent. I was taking 4k IU during colder months of WFH and after a few months had to reduce it because I was getting close to the upper acceptable limit (starting from low levels). It's important to calibrate with regular tests.