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This can develop gradually and symptoms may take months or even years to appear
"Optic neuropathy as a presenting feature of vitamin B-12 deficiency: A systematic review of literature and a case report"
Unlike food or oral supplements, vitamin B12 injectionswhich are injected under the skin or directly into the musclebypass your gut and go directly into your bloodstream to help counteract the effects of a deficiency, says Foxx
Any visible material, fibers, flecks or debris, means the vial is done
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