Benefits of subcutaneous administration include: Easier for patients to give themselves injections Less risk of muscle irritation Potential for slower absorption, depending on the injection site Intravenous (IV) Usage in Clinical Settings Intravenous Vitamin B12 is usually used for severe deficiency cases or when quick correction is needed
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PubMed Cox, H.D., Smeal, S.J., Hughes, C.M., Cox, J.E., & Eichner, D
There should be little to no bleeding since the wound will be smaller than a mosquito bite