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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).
More specifically, optimal levels are generally close to a central tendency of the values found in the population. However, usual and optimal levels may differ substantially, most notably among vitamins and blood lipids, so these tables give limits on both standard and optimal (or target) ranges.
While some studies have found that vitamin D 3 raises 25(OH)D blood levels faster and remains active in the body longer, [163] [164] others contend that vitamin D 2 sources are equally bioavailable and effective as D 3 for raising and sustaining 25(OH)D. [153] [165] [166]
A circulating level of 25-hydroxyvitamin D greater than 30 ng/mL is required to maintain a healthy level of vitamin D, ... “Women who are breastfeeding should consider higher doses of like 5,000 ...
The Scientist: Michael T. Murray, N.D., co-author of the "Encyclopedia of Natural Medicine." The Answer: More than half—perhaps up to 70 percent—of Americans are deficient in vitamin D. If you ...
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
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 .
The prevalence of vitamin D deficiency amongst those with dark skin, or those who cover their skin for religious reasons, can be directly attributed to extremely low sun exposure, which is the main source of vitamin D in Australia. Veiled women or individuals with dark skin pigmentation are vulnerable to a fall of vitamin D to levels considered ...
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