There is no consensus on optimal vitamin D levels, with proposed cutoffs for deficiency at 30 ng/mL and sufficiency at 50 ng/mL, while some suggest 75 ng/mL.

“there are two levels that have been published and people will die in a ditch over those um if you've got PE smart people feeling that strongly about two different levels it tells me that nobody really knows what are the two levels that people are dying over uh 30 is probably one of them right 30 seems to be one of the cut offs 30 is is the um I believe is the deficiency cut off 30 yeah milliliter and and 50 is considered sufficient so in between that you would have um insufficiency okay um but other people say it's 75”