how often should you get vitamin b12 injections Injections? Optimal Vitamin B12 Dosage and
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Allowing the vial to reach room temperature for 15 to 20 minutes before drawing your dose reduces this substantially

It sits well under the ~500 Da Lipinski cutoff for good oral absorption, so absorption is built into the chemistry
They may also give you dietary advice so you can increase your folate intake

Repeated missed doses will impact results, so establish systems to ensure consistency
Pharmacodynamics of AOD-9604 in Energy-Expenditure Assays, Peptide Science