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The risk of Vitamin B12 toxicity is low with proper guidance
However, certain individualssuch as those with Lebers disease, a hereditary eye conditionshould not receive vitamin B12 injections due to the risk of optic nerve damage
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Regular screening may be done if you have risk factors or symptoms such as fatigue, numbness, or pale skin
(PubMed) Lin J, Lee IM, Cook NR, et al
For people with a B12 deficiency, injections are often prescribed because they allow for better absorption than oral supplements
Homocysteine also shows folate and vitamin B6 levels
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