its not yet prescribable through legitimate compounding pharmacies
If you have an issue with absorption, such as due to Crohns disease or other gastrointestinal issues, B12 injections may be most effective
Finding Walk-In B12 Injections If you have a busy schedule, youll be happy to know that finding a walk-in B12 injection is easier than ever
American Journal of Clinical Nutrition, 115(4), 787-789
Vitamin B (pyridoxine), when chronically taken in gram quantities, is known to cause a sensory neuropathy, numbness and tingling in the extremities, but the amount of B in this formula (2 mg per mL) is far below such neurotoxic levels
Allergic reaction , rare but possible, particularly to the cobalt component of cobalamin