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is b12 a subcutaneous injection How to self-inject intramuscular vitamin - Overview Best Vitamin B12 Injection Sites
Description
The disulphide bond between the two cysteine residues creates a constrained loop structure that is believed to be important for the compounds specific receptor interactions in metabolic research models

This is the reason why you cant overdose on B12, and its also the reason why you want to inject on a daily basis
Older adults

Since NNMT activity has been connected to age-related metabolic alterations, researchers have also investigated its potential involvement in healthy aging (4)

According to the NIH Office of Dietary Supplements, absorption issuesnot intake aloneare a leading cause of low B12 levels