The right choice depends on your individual cause of deficiency, your symptoms, and how quickly you need results
In fact, the absorption of B12 requires that you have adequate stomach acid (among many other factors), which means that if you are taking acid blockers for reflux you are likely reducing your absorption of B12
For in-vitro laboratory research only not for human or veterinary use, diagnosis, or treatment
Two weeks later, still feeling sluggish, I went to see my internist, who gave me a full physical, some homeopathic cures of her own, and an injection of vitamin B12 in my butt
Real Science
Never reuse syringes each draw requires a fresh sterile syringe and needle to prevent bacterial contamination of the vials contents