“Vitamin D Sufficiency Threshold and Metabolic Syndrome Protection in Chinese Elderly People”

https://pubmed.ncbi.nlm.nih.gov/38115666

In Chinese elderly people, the optimum threshold for vitamin D sufficiency, when PTH is maximally inhibited, is preliminarily observed to be in the range of 19.62-28.44 ng/mL, and this threshold may vary with gender; and more sufficient levels of vitamin D are protective against metabolic syndrome in this population.