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The Advantages of B12 Injections Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine
B12 deficiency can occur for several reasons, including- Dietary Restrictions- People following strict vegetarian or vegan diets may not consume enough B12-rich foods, leading to deficiency
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[DOI] [PMC free article] [PubMed] [Google Scholar] 28.Searching and synthesising 'grey literature' and 'grey information' in public health: critical reflections on three case studies
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