youtube how to give a b12 injection in thigh Treating Severe Vitamin Deficiency How to Inject Vitamin B12
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Its small and membrane-permeable, so it survives the gut and absorbs on its own

If you dont have a deficiency and youre just doing it because its trendy, you are putting a serious stain on your organs and if you have a misdiagnosed heart or kidney problem, you could make it worse or cause serious problems

A Systematic Review of the Predictive Validity of Neurobehavioral Assessments During the Preterm Period
doi: 10.1016/j.radonc.2011.05.086
