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Intramuscular injections of B12 are administered during the first stage of the test, an hour after the patient takes an oral dose of radiolabeled vitamin B12

You might also notice systemic benefits

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Long-term human safety has not been fully established

Most researchers report initial changes between two and three months, with more substantial improvements visible at four to six months

Qin C, Wu M, Wang X, Zhang W, Qi G, Wu NY, et al