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The primary dietary sources of vitamin B 12 are meats, fish, shellfish and dairy products and as such the deficiency has been reported to be the highest among populations with predominantly a vegetarian or vegan diet 12,13
Learning to give an intramuscular (IM) injection may become a necessity if you, or a family member, suffer from an illness that requires injections of medication
The oral daily dose far exceeds the vitamin requirement because the normal transporter protein-mediated absorption is absent, leaving only very inefficient intestinal passive absorption
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Most patients receive injections either weekly, biweekly, or monthly
