vitamin b12 injections side effects Injections: What You Need To Know B12 Shots Side Effects And
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It is supplied strictly for research use only and is not approved for human or animal administration

For tracking changes accurately, take photos in identical lighting and posture every 2 weeks

If you do not feel a dramatic change in the first 48 hours, that is completely normal and does not mean the shot is not working

Firstly, it is not routinely tested, and secondly, low levels are often labeled as normal e.g

When breastfeeding Vitamin B12 deficiency in nursing infants has been linked to developmental delay