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If you are having B12 injections for a genuine deficiency, this is the context that helps you tell a settling-in reaction from a real problem
Community research plans now often model subcutaneous amounts, but no approved clinical protocol or published human pharmacokinetic study has established those subcutaneous amounts
Adults usually get 1000 mcg (1 mg) of vitamin B12 per injection
J Clin Biochem 1984;17:99-107
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