do b12 injections contain b2 What are the benefits of injection? Sublingual B12 vs. B12 Injections:

Different motivation for each, most likely

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For most people with straightforward B12 deficiency due to dietary insufficiency , oral cyanocobalamin at doses of 50-150 micrograms daily between meals is the standard UK recommendation

Add-back therapy involves taking a small dose of estrogen and progesterone, which helps prevent menopausal symptoms while protecting your uterus

PubMed: 18283677 Pharmacokinetics and Bioavailability of AOD 9604 in Healthy Subjects human pilot Wallace JD, Cuneo RC, Lundqvist G, et al

It is the most effective way for the body to absorb Vitamin B12