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b12 where to inject How self-inject intramuscular vitamin - Overview Where to Safely Inject B12:
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In short, an injection will provide a higher dose of B12 at regular intervals, whilst oral supplements have a lower dosage and can be taken every day

[DOI] [PMC free article] [PubMed] [Google Scholar] 75.Sperber H, et al

Vitamin B12 is water-soluble and excess amounts are normally excreted through urine, providing natural protection against toxicity

However, it can take several weeks for the full benefits to be realized, depending on the individual's level of deficiency and response to treatment.
