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Vitamin D deficiency or hypovitaminosis D is a vitamin D level that is below normal. It most commonly occurs in people when they have inadequate exposure to sunlight , particularly sunlight with adequate ultraviolet B rays (UVB).
A global representation of vitamin D status in healthy populations (2012) A global representation of vitamin D status in healthy populations: reply to comment by Saadi (2013) File:BlankMap-World6.svg. Own work: Author: The RedBurn
Serum 25(OH)D concentration is used as a biomarker for vitamin D deficiency. Units of measurement are either ng/mL or nmol/L, with one ng/mL equal to 2.5 nmol/L. There is not a consensus on defining vitamin D deficiency, insufficiency, sufficiency, or optimal for all aspects of health. [23]
Research has shown that vitamin D3 tends to be more effective than vitamin D2 supplementation when trying to increase serum vitamin D levels, says Pelitera. “In bloodwork, we measure Vitamin D ...
Additionally, they had a serum 25-hydroxy vitamin D level between 10 and 30 ng/mL. Anything below 30 ng/mL is considered insufficient, while values less than 20 are classified as vitamin D deficiency.
A circulating level of 25-hydroxyvitamin D greater than 30 ng/mL is required to maintain a healthy level of vitamin D, per the NIH—so if you're lower than that, your doc may suggest a supplement.
However, in more recent literature many researchers have considered 30 ng/mL to be an insufficient concentration of vitamin D. [6] Subnormal levels of vitamin D are usually caused by poor nutrition or a lack of sun exposure. [5] Risk factors for hypovitaminosis D include premature birth, darker skin pigmentation, obesity, malabsorption, and ...
D3 is better at raising blood levels of vitamin D, but D2 also works well. The main thing, says Dr. Manson, is to take whichever you choose along with a bit of food that contains fat .
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