Welcome to this Vitamin D Study Hour with Dr. Michael Holick, where we discuss Practical Uses of Vitamin D for Disease Prevention — from what the guidelines recommend to real‑world use and disease risk reduction.
In this video, Dr. Holick reviews decades of research showing how vitamin D levels are strongly linked to reduced risk of many chronic diseases, including diabetes, infectious diseases, autoimmune conditions, and cancer. This discussion is built on evidence showing that higher 25‑hydroxyvitamin D levels (≥30 ng/mL and optimally ~40–60 ng/mL) are associated with significant decreases in disease risk, yet these outcomes are not reflected in many current public health guidelines.
