The version I prescribe comes from a US-manufactured, cGMP-certified pharmacy, with a certificate of analysis, on a dose I selected for the patient and the procedure
Therefore, before establishing expectations on B12 shots, you should talk to your doctor to see if you need to adopt a healthier lifestyle or take additional supplements in addition to B12 injections
For example, the roles of genetic predisposition, age, and comorbidities in modulating susceptibility to neurotoxicity remain underexplored
Round to the nearest half or whole unit you can read reliably, or reconstitute with a different amount of water so the dose lands on an easier mark
Absolute contraindications include active malignancy, pregnancy, and lactation