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Oral supplements need to pass through the digestive system before they can get into your bloodstream, but a B12 injection goes straight to your bloodstream
Some medications have also been shown to increase the risk of a deficiency
We scoured the medical database for reports of allergic reactions to B12 shots, and this is all we could find
Parenteral preparations containing benzyl alcohol should not be used in epidural or spinal anesthesia procedures
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