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Madl T, et al

Long-term safety data from the STEP 5 trial demonstrates that participants who continued therapy for two years experienced most of their side effects during the first 6 months, with markedly fewer events in the second year
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doi: 10.1210/jc.2006-1702

Hydroxocobalamin , the most commonly used form in the UK, has a significantly longer duration of action compared to cyanocobalamin

If you want to stretch the vial across multiple smaller doses, add 2 mL of bacteriostatic water instead