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How Fast Does a Vitamin B12 Shot Work
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The Grading of Recommendation, Assessment, Development, and Evaluation (GRADE) tool was used to assess the certainty of the evidence for the two primary biochemical outcomesserum vitamin B12 concentration increase and homocysteine reductionacross all included studies, and separately for randomised controlled trials (RCTs) and observational studies
Its estimated that up to 13% of people over 60 have low levels of vitamin B12(2)
Typical shot schedules use a short loading phase (26 weeks) followed by monthly to every 23 months maintenance (AAFP
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