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over the counter b12 injection Methylcobalamin (Vitamin B12) it’s possible you have a B12 deficiency Vitamin B12 Injection at a
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Normally, humans maintain a large vitamin B 12 reserve, which can last two to five years even in the presence of severe malab-sorption

Arendt JF, Farkas DK, Pedersen L, Nexo E, Srensen HT

Proton pump inhibitors (PPIs) reduce stomach acid, which is needed for B12 absorption