Cochrane Handbook for Systematic Reviews of Interventions: Cochrane Book Series
Research has shown that vitamin pills and injections both have different levels of effectiveness
While B12 injections are not a weight loss treatment on their own, they can support an active lifestyle and healthy metabolism
Typically, intramuscular injections might be given daily during the first week, followed by weekly shots for one month, and then every month or two months for life
References Boachie, J., Adaikalakoteswari, A., Samavat, J., & Saravanan, P
If you have one of those conditions, getting B12 injections can prevent a deficiency before it starts