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b12 injection procedure Best Vitamin Site: Administering B12 Shots Vitamin B12 Injection Sites: All
Description
Further reading [edit] Wintrobe's Clinical Hematology Thirteenth Edition

B12 shots are generally considered safe with minimal side effects

If any side effects do occur, they are usually mild and temporary

Those with naturally high NNMT activity might respond more dramatically to inhibition, while those with lower baseline activity might see more modest effects