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Medications: Certain medications, such as proton pump inhibitors and metformin, can interfere with the absorption of vitamin B12

Vitamin B12 (cobalamin) is essential for red blood cell formation, nerve health, DNA synthesis, and cellular metabolism (Mayo Clinic)

However, in rare casessuch as patients with kidney disease or specific hereditary disorders related to vitamin B12 metabolismhigh doses or inappropriate use could potentially cause complications

This ratio also gives you exactly 20 doses of 0.25mg from a single vial