Regular sun exposure is beneficial for vitamin D levels from "summary" of The Vitamin D Solution by Michael F. Holick Ph.D., M.D.
Regular sun exposure is essential for maintaining adequate levels of vitamin D in the body. When our skin is exposed to sunlight, it produces vitamin D from a cholesterol precursor. This process occurs in the skin's epidermis and is dependent on ultraviolet B (UVB) radiation from the sun. The amount of sun exposure needed to produce enough vitamin D varies depending on factors such as skin pigmentation, geographic location, time of day, season, and the use of sunscreen. Generally, it is recommended to expose arms and legs to the sun for about 5-30 minutes, a few times a week, during peak sunlight ho...
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