
Fatigue Could Signal Vitamin D Deficiency, Doctors Say
Vitamin D deficiency is the most common micronutrient shortfall in the U.S., with about 94% not meeting daily needs. Fatigue is the top symptom (often persisting despite sleep), plus sweating, joint/muscle pain, and mood changes. Vitamin D supports bones, calcium absorption, immunity, and inflammation control. NIH recommends 600–800 IU daily, but experts often suggest 1,500–2,000 IU; taking more than 10,000 IU daily can be dangerous. Get your levels checked and follow a personalized plan from a doctor, and remember supplements are not medicines and should be used cautiously in pregnancy, nursing, or for children.













