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However, other studies have indicated that HLA-DR antigens, such as DR2 and DR4, may interact with closely linked genes to influence susceptibility to conditions such as pernicious anemia, which can be associated with cobalamin deficiency [154, 155]

Vitamin B12 is an essential nutrient that plays a critical role in: Red blood cell production Nervous system function DNA synthesis Energy metabolism Cognitive health While many people obtain sufficient Vitamin B12 through their diet, some individuals may have difficulty absorbing or maintaining adequate levels

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Medicare Part D covers prescription drugs, and private insurance companies administer these plans