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Some notice it even sooner
It is a vital nutrient responsible for keeping the nervous system and blood cells healthy
Pernicious anemia occurs more commonly in people who already have diseases that are linked to immune-system abnormalities, such as Graves disease, hypothyroidism (under-functioning thyroid gland), thyroiditis (inflammation of the thyroid), vitiligo, and Addison's disease (adrenocortical insufficiency)
For each eligible study, two authors (MM and AN) independently extracted data, which was then reviewed by a third author (JV) using a piloted spreadsheet, in accordance with Cochrane Collaboration guidelines ( Where relevant data were missing, attempts were made to contact corresponding authors
A deficiency can manifest as dryness, acne, or even hyperpigmentation
Vitamin B12 injections are generally safe when administered by qualified professionals
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