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Many clinicians routinely test patients' vitamin D levels and recommend oral supplements to get levels higher than 30 ng/dL, despite controversy on the merits of this practice. In 2024, the Endocrine Society published a new guideline that recommends a more conservative approach to vitamin D testing and provides some clarity on when supplements should be used (NEJM JW Gen Med Sep 1 2024 and J Clin Endocrinol Metab 2024; 109:1907).
Most notably, the guideline does away with the concepts of vitamin D “sufficiency,” “insufficiency,” and “deficiency” altogether. It notes that current evidence does not show that supplementation specifically benefits asymptomatic people with low baseline levels and recommends against any routine testing of vitamin …