Vitamin B12 levels can be tested to determine if supplements are needed or since the injections are relatively inexpensive and have a broad safety margin, sometimes they are simply prescribed without testing
Any suspected adverse reactions to medicines can be reported through the MHRA Yellow Card scheme
Ng KW, Faulkner N, Finsterbusch K, Wu M, Harvey R, Hussain S, et al
No matter the case, youre right to be concerned
Further, there is a reduction in enteric serotonin concentration, attenuated intestinal motility, increased survival of cultured enteric neurons, the proliferation of cultured EGCs [119], and a particular effect on maintaining platelets function [128,129,130] (Table 2)