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This makes injections the superior choice for optimal effectiveness in these scenarios
Immune system disorders, such as Graves' disease or lupus, are also linked to vitamin B12 deficiency
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Equivalent effects have not been established in people
Injections bypass the digestive tract, which makes them more effective for people with absorption issues or severe deficiencies
Nayana Shetty, MBBS, MD When to See a Doctor Although rare, some people may experience side effects of high vitamin B12 levels such as headaches or skin reactions
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