where does the vitamin b12 injection go Injections B12 Shots at Home: How,
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In short, every system in your body relies on vitamins to stay healthy

doi: 10.1038/nature07319 61 SprangerMKrempienSSchwabSMaiwaldMBrunoKHackeW

Have certain medical conditions: Problems that can restrict vitamin B12 absorption include pernicious anemia (a rare autoimmune disease that keeps the body from making a protein necessary to absorb B12), digestive illnesses, such as celiac and Crohns diseases, and immune disorders such as lupus, among others

That means visible body composition changes take longer than with GLP-1 drugs
Cost is worth considering