Questioning Medicine

In 2011, the Endocrine Society published a guideline on “Evaluation, Treatment, and Prevention of Vitamin D Deficiency”   Now, the Society has issued an updated guideline, Demay MB et al. Vitamin D for the prevention of disease: An Endocrine Society clinical practice guideline. J Clin Endocrinol Metab 2024 Aug; 109:1907. (https://doi.org/10.1210/clinem/dgae290)  Previously, the Endocrine Society had labeled vitamin D status as “deficient” when serum hydroxyvitamin D (25[OH]D) was lower than 20 ng/mL, and “insufficient” when serum 25(OH)D was 20 ng/mL to 29 ng/mL. Now, the Society “no longer endorses specific 25(OH)D levels to define vitamin D sufficiency, insufficiency, and deficiency.”  Why is that--- because no clinical research has not established distinct thresholds of serum levels that can be tied confidently to specific clinical outcomes. In the general population of adults (age range, 19–74), neither routine vitamin D supplementation nor routine testing of 25(OH)D levels are recommended. What about >