pernicious anaemia and b12 injections (an autoimmune disorder which results in reduced production of intrinsic factor) is the most common cause of severe vitamin deficiency in the UK π Struggling with B12 injection
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Vitamin B12 in relation to oxidative stress: a systematic review
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Hydroxocobalamin acetate ampoules, vitamin B12a

Pernicious anaemia is a megaloblastic anaemia, because a lack of vitamin B12 also commonly referred to as cobalamin can cause abnormality in haematopoietic cell maturation[2]

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