Sunlight plays a far greater role in human health than most people realize, extending beyond bone health from vitamin D production into circadian biology, immune regulation, eye health, metabolism, and healthy aging.
In this special Sunshine Month webinar, Dr. Alexander Wunsch shares a balanced scientific perspective on sunlight and human biology. Drawing from decades of research in photobiology and light medicine, Dr. Wunsch explains how sunlight acts not only as a source of vitamin D, but also as a powerful biological signal that influences circadian rhythms, autonomic function, mental health, mitochondrial activity, and recovery processes.
The presentation explores the complex relationship between ultraviolet light, visible light, infrared radiation, melatonin, and vitamin D, while emphasizing the importance of proper timing, intelligent dosing, and maintaining healthy light-dark rhythms.
Key topics discussed include:
• Why sunlight is both beneficial and biologically stressful
• The difference between heliotherapy and helioprevention
• How light regulates circadian rhythms and autonomic balance
• The roles of UVB, UVA, visible light, and infrared light
• Forest light environments and filtered sunlight exposure
• Melatonin, darkness, and nighttime recovery
• Morning sunlight, red light signals, and chronobiology
• Sunglasses, eye protection, and retinal health
• Near-infrared light and mitochondrial function
• Red light therapy vs natural sunlight
• Safe sun exposure practices and avoiding erythema
