By Marc Sorenson, The Sunlight Institute

Researchers from the Solar Radiation Research Group at the Polytechnic University of Valencia (UPV) estimated the time needed to make 1,000 IU of vitamin D from the sun, and avoid sunburn among individuals from Spain.

Despite common misconception, vitamin D deficiency is still common in warm places, such as California, Spain or Pakistan. This study was conducted to determine the ease or difficulty of getting vitamin D throughout the year without risking unsafe sun exposure.

The researchers analyzed ultraviolet solar irradiance (UVER) during peak sun hours, usually between solar noon and 1:30, one month per season. All individuals in the study were considered to have skin type III, a common skin type in Spain. The researchers wanted to find out how long it takes to make 1,000 IU of vitamin D, as well as the time it would take for an individual to risk burning the skin.

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