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If you have a B-12 deficiency, it can be more challenging to lose weight, and you might feel sluggish or tired, so B-12 injections can help boost your energy and metabolism.
Retrieved 16 February 2017
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When liver function deteriorates significantly, the combination of released stored B12, increased circulating haptocorrin, and reduced hepatic clearance can result in markedly elevated total serum B12 levels
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