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Some individuals may experience: These reactions are generally mild and often resolve within a short period of time
Ingredient-level citations are attributed to the ingredient - not used as proxies for whole-product outcome claims
Oral route of vitamin B12 administration: In the case of vitamin B12 malabsorption, irrespective of the cause of malabsorption, the intramuscular route is preferred
16 Participants Participants were recruited using advertisements in social media support groups for individuals with vitamin B12 deficiency/pernicious anaemia (see Acknowledgements)
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