Cox HD, Lopes F, Woldemariam GA, Becker JO, Parkin MC, Thomas A, Butch AW, Cowan DA, Thevis M, Bowers LD, Hoofnagle AN
[153] There is evidence that for elderly people, physicians often repeatedly prescribe and administer cyanocobalamin injections inappropriately, evidenced by the majority of subjects in one large study either having had normal serum concentrations or having not been tested before the injections
Potential Side Effects and When to Seek Medical Advice B12 injections are generally well-tolerated, with serious adverse effects being rare
Definitions of elevated levels seem to be a bit wobbly, and a lot more, high quality evidence is definitely required
Start my free visit Illustration only not the actual vial