Vitamin B12 is water soluble and can be administered by intramuscular or deep subcutaneous injections, so regardless of whether you inject into fat or muscle, it will absorb into your body
Benfotiamine B1 Not B12 but often combined to relieve nerve pain
Its primary mechanism is believed to pivot around enhancing lipolysis, the breakdown of fat, and suppressing lipogenesis, the process of fat accumulation [More et al., 2014]
Each of these components that are formed into a solution is important and provides their own key roles as fat burners, utilizing the fat accordingly, distributing energy, and removing toxins from the body
That's the scientific method in action, isn't it
Frequency depends on your deficiency and goals some get them weekly, others monthly