Tell your healthcare provider if you have ever had a reaction after you received vitamin B12 by injection or IV infusion
Methylcobalamin, on the other hand, is a naturally occurring form of B12
Vitamin B12 Injection Ships from Canada to US through the available service pathway, with prompt, express shipping used as a logistics option when applicable
Last reviewed: June 6, 2026 Last updated: June 6, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations
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Seek immediate medical attention if you experience signs of heart failure, such as sudden weight gain or unusual tiredness