You can’t benefit from the vitamin D by staying inside, even if you are sitting in the sun by a window or in a conservatory or ‘sunroom’. Glass windows block this wavelength which means that your skin won’t be making vitamin D through glass. The resulting chemical is called 7-dehydrocholesterol. No, because vitamin D is only produced by the body when UVB rays touch the skin. All UV penetrates water, so swimming won't reduce the amount of vitamin D you make. UVB is the form of ultraviolet light that produces vitamin D in the skin. It is best to get your sun when the UV index is high, because you need to spend less time in the sun.
A UV index of 14 means it's 14 at midday and around half that at 10 am and 2 pm. Time of day - the UV index varies throughout the day, climbing to a peak at midday and then dropping.UV Index - which is dependent on time of year.Vitamin D dampens the inflammatory immune responses and protects brain cells. The sun's UVB rays help the skin synthesize vitamin D, which is essential for human health, and especially for people with MS.
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