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People taking high-dose B12 supplements (1,000 to 5,000 mcg daily), receiving B12 injections (cyanocobalamin or methylcobalamin), or consuming heavily fortified foods can easily push their serum levels above 900 pg/mL
Your doctor will consider your labs, symptoms and health history to make sure a B12 supplement is right for you
Patients with a history of allergic reactions to injectable B-vitamin preparations should use caution
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