b12 injections deltoid muscle Intramuscular injection - Everything You Need To Know Deltoid Intramuscular Injection: Technique, Site,
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2,9,10 At the start of oral vitamin B12 replacement therapy, close monthly monitoring of laboratory results and symptoms is recommended, thereafter annual monitoring should suffice

Notice how 10 units at this concentration delivers the standard starting dose of 0.25 mg

doi:10.3390/nu11030557

They may say its okay to stay on your multivitamin, itll just ensure youre getting everything else too, or they may prefer you stop it during injection treatment to accurately assess what the injection alone is doing for you
