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vitamin b12 injection loading dose Dosage for Adults: Guidelines B12 Injection Dosage and Frequency:
Description
[22] The injections are usually given in a clinic setting, but in some cases patients may be taught to self-administer at home under medical guidance

Its harmless

This means they might need different amounts of B12 than others

Other B vitamins may turn it green
L., et al

While some may witness changes in a matter of weeks, others might find their transformation unfolding over the course of months
