I agree MrsD. Grain of salt with what Dr O says. Total of 50's probably good. I'm holding 80's with 2000/day & Florida sunshine daily yet the MS's still progressing but like I said, when my level was over 100 I felt the best (8000iu/day).
You's know there's a few D tests besides total D. I'll have to dig my results out. I don't know if its like my testosterone but there's a "free" & "total" #. I always go by total testosterone.