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vitamin b12 injections intramuscular or subcutaneous Injection Sites: All You Need to Know B12 Shots vs. IV Infusions:
Description
B12 supplementation is very safe and side effects are very rare, but supplementation is often required for life
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doi: 10.1016/bs.vh.2022.01.011

Serum methylmalonic acid and holotranscobalamin-II as markers for vitamin B 12 deficiency in end-stage renal disease patients Ann Clin Lab Sci 2013;43:243-9

At 47 years of age, she underwent left retromastoid microcraniectomy to solve a vascularnervous conflict at the origin of the left facial nerve in the bulb-pontin
