vitamin b12 injection side effects Are Shots Safe? Royal Palm Beach Medical Group What are the benefits of

Most B12 in the UK is injected into muscle, but the fatty subcutaneous route is a recognised alternative

The NIH Vitamin B12 Fact Sheet for Health Professionals notes that oral supplementation is appropriate for many patients who do not have intrinsic factor deficiency

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This makes oral supplements less effective for individuals with: Pernicious Anemia: An autoimmune condition where the body can't produce intrinsic factor

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