Is is true that you cannot synthesise Vitamin D when the altitude of the sun is less than 50 degrees? Your Sunshine Calendar shows Los Angeles in the winter as available sunbathing time. The sun altitude of Los Angeles is less than 50 degrees from about October to March. Is the Sunshine Calendar incorrect?

Asked by  doverman53 on October 28, 2014


  • Jeff Nicklas
    Keymaster
     Jeff Nicklas on

    It is commonly believed that vitamin D production from sunlight is virtually possible year round at a latitude of 34 degrees or less.

    Los Angeles sits at a latitude of around 34 degrees meaning that you will likely be able to produce vitamin D from the sun year round. That being said, other factors such as air pollution and cloud cover can block the UVB rays from reaching the surface.

    It is important to note that the Sunshine Calendar is more of an estimated tool than a definite measure of available sunlight. It is based on scientific evidence, but the extraneous factors I mentioned above (i.e. cloud cover) can alter the availability of vitamin D production from the sun.

    Answered by  Jeff Nicklas on

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