how to give yourself vitamin b12 injections at Home - Safety Guide for Self-Administration How to Self-Inject Vitamin B12

Similarly, Mills et al

L'absorption intestinale de la vitamine B 12 a lieu uniquement au niveau de la portion terminale de l'ilon [15]

The Phase 3 OPTIONS study (536 subjects, 24 weeks) failed to show statistically significant weight loss compared to placebo

Yao WC, Chen HJ, Leong KH, et al

It can also play a role in mitochondrial dysfunction in the development of cardiovascular problems.[ref] Riboflavin is central to many pathways in health, with insufficiency affecting hair, skin, nails, energy, cognitive function, and reproductive health

It is inadvisable to give yourself an injection of any sort unless you are fully confident in your ability to inject the drug or supplement safely, and this applies to a B12 injection too