does b12 have to be an injection Best Vitamin Sites: Where Inject B12 · PA Relief Do B12 Injections Hurt? Painful
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A simple blood test found the trigger

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Freezing damages the peptide structure irreversibly and renders the medication unsafe and ineffective

The combination of a PPI and metformin would absolutely require regular laboratory tests for vitamin B12

They state that no data is available yet for this particular group of people on safety/side-effects: People with autoimmune conditions may receive a COVID-19 vaccine
