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This is especially true if you are a vegan, are older than age 50 and of African American or Northern European descent, have an autoimmune disorder, or have had your stomach removed
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Contact your GP if you notice no improvement after 46 weeks of treatment, experience worsening neurological symptoms, or develop new unexpected symptoms
Olasupo Odunsi, MD, Medical Director Reviewed July 22, 2026 B12 shots are marketed everywhere as a weight loss booster
B-Complex Cautions and Warnings Necessary B vitamins are generally well tolerated with instances of sensitivity being rare
