Altarcha, G.K. et al. 2026. Nonlinear Relationship Between Serum 25-Hydroxyvitamin D and Glycemic Control Among US Adults: A Survey-Weighted Analysis of NHANES 2017–2018. Journal of Endocrinology & Metabolism. 16, 4 (Jan. 2026), 167–171. DOI:https://doi.org/10.14740/jem1658.