In this episode of Pulse, Dr. Peter McCullough and epidemiologist Nicolas Hulscher discuss the critical role of vitamin D in health and disease prevention. They highlight the alarming prevalence of vitamin D deficiency, particularly in modern societies where people spend less time outdoors and frequently use sunscreen. Nicolas explains that vitamin D is essential for immune function, and recent research from the McCullough Foundation suggests it may play a role in improving post-COVID vaccine injury syndromes, including chronic fatigue syndrome and myocarditis.