What’s the Optimal Vitamin D Level? This Landmark Study Offers a Clue
Dr. Kumar’s Take:
This landmark review pulled together a wide range of studies to answer a crucial question: What blood level of vitamin D supports the best health? Across outcomes like bone strength, fall prevention, dental health, and even colon cancer risk, the sweet spot starts around 75 nmol/L (30 ng/mL), but 90–100 nmol/L (36–40 ng/mL) seems ideal. For most adults, that likely means supplementing with at least 1000 IU of vitamin D3 per day—especially in winter or if you get little sun exposure.