The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
the the endocrine Society the national endocrine Society has established that people that have serum levels of 25 hydroxy vitamin D which is the precursor of vitamin D less than 20 nanograms per mil are considered deficient if you have less than 30 nanograms per mil that's considered inadequate
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the reason the endocrine society defines vitamin D deficiency as below 20 nanograms per milliliter by the way is because this is the cutoff point where parathyroid hormone levels which are involved in calcium homeostasis start to rise outside of healthy ranges
according to The Endocrine Society blood levels of 25 hydroxy vitamin D below 20 nanograms per milliliter is considered deficient and less than 30 nanograms per milliliter is insufficient
According to the endocrine society, blood levels of 25 hydroxy vitamin D below 20 nanograms per milliliter is considered deficient and less than 30 nanograms per milliliter is considered insufficient.