can you inject vitamin b12 subcutaneous Best Injection Site: Administering B12 Shots How to Self-Inject Vitamin B12

This is really about personal preference

This mechanistic distinction means the compound could theoretically be combined with appetite-suppressing peptides for a protocol that simultaneously reduces energy intake (GLP-1) and restores adipocyte energy expenditure (NNMT inhibition) though this remains purely theoretical without published combination data

based on an adult requiring 2.4 mcg/day this provides the equivalent of 417 days of B12

As shown in the Figure above, at the end of a month, weekly nasal administration results in significantly higher serum Vitamin B12 levels than after intramuscular administration