vit b12 injection how to give Self-Inject Vitamin at Home Treating Severe Vitamin B12 Deficiency
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They suffer specifically from insulin deficiency in the hepatic portal circulation as a result of the subcutaneous delivery of insulin (reviewed by Dunger (64))

Murphy and George Minot for discovery of an effective treatment for pernicious anemia using liver concentrate, later found to contain a large amount of vitamin B 12

Who is most at risk of vitamin B12 deficiency
