injections of vitamin b12 are given in the treatment of B12 Shots at Home: How,

B vitamins are involved in a variety of physiologic processes, including supporting normal nervous system function, red blood cell production, and cellular health

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So, what are B12 shots

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A typical FDA-approved regimen for pernicious anemia includes: 100 g IM/SC daily for 67 days Then every other day for 7 doses Then every 34 days for 23 weeks Followed by 100 g monthly for life Schedule follow-up and monitor progress Potassium levels should be monitored during the first 48 hours of treatment, as rapid red blood cell production may lead to hypokalemia and, rarely, sudden death