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Generic PDFs that apply to all batches are not meaningful quality evidence
Key risk factors of vitamin B12 deficiency include: Decreased ability to absorb vitamins as a result of low hydrochloric acid secretion Certain medications Gastrointestinal disease and surgeries Vegans are also at a higher risk of vitamin B12 deficiency Can You Have Too Much Vitamin B12
Published human trials mainly studied oral and intravenous forms, so subcutaneous amounts come from community practice rather than an approved clinical protocol
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Science 229 , 867869 (1985)
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