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Vitamin B12, also known as cobalamin is a water soluble vitamin. It is critical for normal functioning of the red blood cell formation and nervous system. It is a complex vitamin and it's deficiency is known to be one of the commonest deficiency in Indian population particularly in elderly and in vegans as it requires castles intrinsic factor released by parietal cells in the stomach for its absorption. Vitamin B12 deficiency may also result from pernicious anemia, gastrectomy & intestinaldoi:10.26440/ihrj/0301.04.521066 fatcat:xhtpjixhzvfhnmabxuiqtbm4pq