Inadequate intake: is the most common cause , rarely absorption problem also. Recently more and more have Vit D deficiency , as people are avoiding exposure to sun . Body can not synthesize Some even call ' cancer preventing vitamin , as its levels are low in cancer patients . Vit C need , fresh citrus group is the best natural source , try to supplement and see the results.Speak to your doctor
Answered 5/24/2017
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