The paper outlines how UVB light affects the body not only through vitamin D, but also by sending signals from the skin to the brain. UVB is especially effective at triggering the production of hormone-like molecules, including stress-related hormones and natural opioids like beta-endorphin, which can enter the bloodstream and influence mood, stress, and behavior. These signals also activate the body’s stress-response system (the HPA axis) and support immune regulation. In addition, UVB-driven signals can reach the brain both through circulation and direct nerve pathways, helping coordinate communication between the brain, immune system, and skin.
Brain & Mood
How UV Light Touches the Brain and Endocrine System Through Skin, and Why
Endocrinology
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