A good provider should help you choose whats appropriate, rather than pushing injections for everyone
These are typified by the following two enzymes: Methylmalonyl-CoA mutase [edit] Methylmalonyl coenzyme A mutase (MUT) is an isomerase enzyme that uses the AdoB 12 form and reaction type 1 to convert L-methylmalonyl-CoA to succinyl-CoA, an important step in the catabolic breakdown of some amino acids into succinyl-CoA, which then enters energy production via the citric acid cycle
The four subcutaneous areas that work best are the lower abdomen, the outer thigh, the back of the upper arm, and the flank or love-handle area
One very important point: injectable B12 is primarily a medical treatment for a diagnosed deficiency
The exact amount depends on the patients health, how bad the deficiency is, and the doctors advice
For example, while the injection covers B, B, B, B, B, you still need other vitamins (like vitamin C, B folate, B if not supplemented separately, etc.) and minerals (iron, zinc, etc.) from food