giving a b12 injection in the arm Safe Guide at Home Treating Severe Vitamin B12 Deficiency

Testing of MMA has additional value in identifying patients with clinically relevant metabolic deficiency when vitamin B12 is below 304 pmol/L (412 pg/mL) (271)

and as my results were low see dr surely that should mean I need it

What is the difference between J3488 and J3489

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This solution is designed for intramuscular or intravenous injection, typically administered using a syringe

Keep in mind that oral B is not well absorbed in people who truly lack intrinsic factor or have certain GI issues, which is why B is usually injected or given as a high-dose sublingual in those cases