Sun and Vitamin D - 6 studies, Oct 2025

Exposure to solar radiation and vitamin D.

National Institute of Health 2025, 73 p. ISTISAN Reports 25/10

Curated by Roberta Pozzi, Sandra Morelli, Maria Cristina Gauzzi

This report aims to bring together multidisciplinary expertise on the risks and benefits of exposure to solar ultraviolet radiation, with a focus on vitamin D synthesized by the body following sun exposure. The following will be introduced and discussed: the role of vitamin D in health and in two diseases: multiple sclerosis, in which the causal role of vitamin D deficiency is more clearly defined and accepted, and COVID-19, in which data on the possible role of vitamin D are still controversial; some methods for measuring solar radiation; open problems related to estimating vitamin D production following solar radiation exposure; the role of smartphone apps for public health; and the usefulness of apps that link measurement of the UV index with skin vitamin D synthesis

Table of contents

📄 Solar and Vitamin D English.pdf

📄 Solar and Vitamin D original.pdf

A few of the tables and images

Related in VitaminDWiki

• 50 ng of Vitamin D - 100 hours of noon sunbathing OR 3 dollars of Vit D
• 3.3 X more likely to be Vitamin D deficient if wear long-sleeves – Oct 2022
• 340,000 US deaths annually due to insufficient sun (some due to low vitamin D) – July 2020

• Vitamin D produced by hands and face is 8X more than elsewhere – Feb 2018

• Health benefit of Sunlight is more than Vitamin D in the blood - many studies

• Sunshine benefits infographic - 2020