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But unless you have a vitamin B12 deficiency, vitamin B12 injections aren't likely to give you an energy boost." Ironically, the National Institutes of Health says that symptoms of B12 deficiency include loss of appetite and weight loss

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However, high-dose oral therapy (1,0002,000 g daily) may be effective in some cases through passive diffusion, with appropriate monitoring

Research suggests that Vitamin B12 may influence appetite by affecting the production of neurotransmitters in the brain, including serotonin