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"The role of vitamin B12 in viral infections: a comprehensive review of its relationship with the musclegutbrain axis and implications for SARS-CoV-2 infection"

doi:10.1016/S0140-6736(21)01751-7 [2] Carvas AO, Leuthardt A, Kulka P, et al

Some people may require more frequent doses to maintain levels of B12 or amino acids, while others may find that less frequent injections are sufficient

Your body is unique and has its own healing timeline

PO vitamin B 12

This ensures immediate bioavailability, especially for patients with absorption issues such as gut inflammation, low stomach acid, or conditions like pernicious anemia