I would like to ask two questions: 1. One is about vitamin D's impact on the immune system. Since vitamin D levels have been found to be low in a number of autoimmune diseases and vitamin D supplementation has been found to be beneficial, does that mean that vitamin D suppresses the immune response and thus "deactivates" an overactive immune system and would that mean that normal immunity in an otherwise healthy person, i.e. free of autoimmune diseases, would be compromised by vitamin D supplementation? 2. Can vitamin D supplementation be addictive? If a person starts supplementing with vitamin D, would they always have to supplement to maintain their level or would they be able to stop supplementing sometimes and still maintain the level reached just by tanning, for example? Thank you very much!

Asked by  Sol y Sombra on February 10, 2015

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  • Sol y Sombra
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     Sol y Sombra on

    See title

    Answered by  Sol y Sombra on

  • IAW
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     IAW on

    The answer to the first question is “No”. If you do not have an autoimmune disease you would not be compromised by taking Vitamin D. Vitamin D deficiency seems to be what actually causes the immune response to go “haywire”. In fact taking Vitamin D should prevent an autoimmune disease from occurring. In less scientific terms, Vitamin D seems to know what it should do and not do. So it can turn things “on” or “off” depending on the need or circumstances.
    The answer to the second question is that “no” supplementation is not addictive. The point, though, is if you are not going to supplement then you must replace it with sunlight or UVB (low pressure) tanning. If you get plenty of sunshine in the summer, then you would only have to supplement in the “low vitamin d months”. If you get “some” sun exposure then you can probably decrease your supplements for that time frame. Keep in mind, depending on where you live, time of year and what skin color you have, determines how long you must spend out in the sunshine to maintain a healthy level.

    Answered by  IAW on

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