b12 injections insurance coeragewss Will Medicare pay for shots? Does Your Medicare Plan Cover
Description
However, it is crucial to note that it should not be used in patients with a known allergy to cobalamin or cobalt

J Am Coll Nutr 1998;17:235-8

So...to your last question...how can you get your GP to consider under treatment of B12 deficency as a potential cause of your ongoing symptoms - including the neurological ones

MTHFR, methylenetetrahydrofolate reductase
It depends on the severity of the deficiency
