Educational context on vitamin D — why deficiency is common in T2D, what large trials show about glycemic effects, and when supplementation makes sense. This page is part of the Diabetes Education hub on Evidence Before Claims. Content is for educational purposes only and is reviewed against peer-reviewed studies, FDA labeling, and current clinical guidelines. It does not provi
Reviewed by Sarah Chen, MD (illustrative reviewer) — MD, Internal Medicine. Last reviewed: May 2026. Educational content only; not medical advice.