what happens if i inject b12 into a vein Vitamin shots: Uses, benefits, and side effects B12 Injections IV Infusions -
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[DOI] [PubMed] [Google Scholar] 47

Although it wasnt asked, there were not and still are not any figures regarding the prevalence of B12 deficiency in children

Frontiers in cell and developmental biology

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Folic acid in very high doses can hide ongoing B12 deficiency

Several neurotransmitters (serotonin, noradrenaline, dopamine, and histamine), peptides (neuromedin U, urocortin, bombesin, amylin, galanin), hormones (thyroid hormone, growth hormone) and cytokines (ciliary neurotrophic factor) also play a role in modulating feeding behavior and energy expenditure [5-10]