In the UK, hydroxocobalamin is the standard injectable form of B12 used in NHS practice
Cyanocobalamin injections are often prescribed to gastric bypass patients who have had part of their small intestine bypassed, making it difficult for B 12 to be acquired via food or vitamins
Its a bit odd, I know, to posit that a disease that can produce explosive diarrhea can cause bloating, gas and constipation while healing occurs, but indeed, this is the case
B12 shots are considered safe for most individuals
When comparing options, it is worth looking beyond price alone
Fortunately, you cannot overdose on vitamin B12, as it is water-soluble, so adding more is not harmful