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can vitamin b12 injections affect your period What is the safety of (Cobalamin) during pregnancy and their potential impact on the menstrual cycle? The Benefits Of Vitamin B12
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Br J Gen Pract 2022;72:e891-8

Oral crystalline cyanocobalamin (commonly available form) is the treatment of choice

The thread on tests for PA and B12 deficiency mentions other tests that can help to diagnose PA eg gastrin test and others (link in my other reply) Forum Support in reply to When you were tested for coeliac disease
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Metformin and risk of vitamin B12 deficiency: new advice
