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In regards to supplementation, the NHS advises that taking 2mg or less a day of Vitamin B12 in supplements is unlikely to cause any harm
Doctors use blood tests, lab evaluations, imaging studies, and physical exams
Preservative-free formulation to minimise risk of irritation: Formulated without preservatives, this injection reduces the likelihood of sensitivity or local reactions
Presented for research literature review only Yang WZ et al
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