can you give vitamin b12 injection subcutaneously Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements Vitamin B12 Injections | B12
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[DOI] [PMC free article] [PubMed] [Google Scholar] 8.Randle P
Symptoms include headaches, dizziness, insomnia, or fatigue
Ageing Research Reviews
So injecting beyond a certain point may cause your cells to fight off the excess B12 so hard that it might reduce the amount of active cellular B12 - probably not to dangerous levels, but possibly sufficient to trigger some symptoms
