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Description
Disadvantages: shorter shelf life from date of compounding, you cannot choose your concentration, typically more expensive per milligram

Possible Side Effects Injection Reactions : Subcutaneous or intramuscular injections may cause temporary local tissue reactions without significant clinical consequences
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10.1007/s12035-014-8705-x 76 MoyseE.KranticS.DjellouliN.RogerS.AngoulvantD.DebacqC.et al (2022)

If someone already has a vitamin B12 deficiency, then utilizing a vitamin B12 injection can help lift their mood
