Bacteriostatic water has benzyl alcohol and is made for multi-dose vials
And it enhances membrane permeability, potentially through interactions with cell surface receptors that recognize arginine-containing compounds
B12 injections are typically administered either intramuscularly (IM) or subcutaneously, with common sites being the deltoid, thigh, or gluteal muscles
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Evidence-Based Medical Insight
So the benefit is real, but it is indirect and it depends on whether you were low to begin with