b12 injection site reactions Adverse to vitamin injections due... : Allergy B12 Shots Side Effects And
Description
A lack of vitamin B12 is treated with methylcobalamin

Pernicious anaemia is caused by your immune system preventing your stomach and gut from absorbing B12 from your food

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While oral supplements are available, B12 injections are often considered more effective because they deliver the vitamin directly into the bloodstream for improved absorption
