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Actually, even lighter skinned people can have lots of trouble generating sufficient vitamin D. My wife's family has the lightest skin possible but they all have vitamin D deficiency, if you have some kind of fatigue it is truly worth having your vitamin levels checked!

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If they're that fair-skinned, is it possible that they're so careful about sunburn/cancer that they're getting less UV than most people?

Pale complexion / skin can also be a symptom of anemia, and certain types of anemia are implicated/related to vitamin D deficiency.

In such cases, both conditions may required supplementation to correct.

So, fair to say that it can get complicated.

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