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It is recommended that adults over the age of 50 increase their sources of vitamin B12 through diet, fortified foods, B12 shots, or other supplements that can increase their B12 consumption. (By The National Institutes of Health) GASTROINTESTINAL ISSUES AND B12 SHOTS Persons who have gastrointestinal issues are particularly predisposed to issues with B12 deficiencies
Food & Drug Administration
Endocrine Reviews
Which symptoms mean I should seek urgent medical advice
Rapid response to prevent and treat B12/Co deficiency
The Cochrane Collaboration, Chichester, UK: John Wiley & Sons
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