b12 injections and folic acid tablets DaVinci Labs stable and highly bioavailable forms of folic acid and vitamin B12 (methylcobalamin) Superior Source No Shot Vitamin
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Jan 17 2020;21(2)doi:10.3390/ijms21020623 Chaudhry R, Usama SM, Babiker HM

The table below shows mixing options for the most common research vial sizes

It is important to note however that the shots must be prescribed by a doctor and given intramuscularly
Adequate B12 levels can prevent anemia and support a healthy cardiovascular system long-term

First you observe some symptoms that clearly tell you that the therapy is going well