1:47 AM
@ColleenV The vitamin has been hyped somewhat in the USA in the last decade
The lower normal limit may turn out to be 20 ng/mL, not the current notch of 30 ng/mL
@ColleenV Not only that! Ideally, you need to check also your calcium, magnesium, ionized calcium, phosphorus, creatinine and PTH - just to exclude some rare interactions that may lead to suboptimal vitamin D metabolism.
I checked some, and have found that my magnesium is a bit below the normal range.
> Holick's role in drafting national vitamin D guidelines, and the embrace of his message by mainstream doctors and wellness gurus alike, have helped push supplement sales to USD936 million in 2017. That's a ninefold increase over the previous decade. Lab tests for vitamin D deficiency have spiked, too: Doctors ordered more than 10 million for Medicare patients in 2016, up 547 percent since 2007, at a cost of $365 million. About 1 in 4 adults 60 and older now take vitamin D supplements.