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Intramuscular injections bypass skin tissue that contains more immune cells, which can reduce reactions for some people
Mol Cell Endocrinol
What is vitamin B-12 and how much do I need
Anyone with a vitamin B12 deficiency should consider getting a supplementary shot
People with liver failure may experience a metallic taste, possibly Read about what causes a metallic taste and fatigue
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What is largely agreed on, however, is that B12 deficiency can reduce energy levels and therefore make it harder to stay active and maintain a healthy weight
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