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Olasupo Odunsi, MD, Medical Director Reviewed July 5, 2026 If you're constantly tired and your metabolism feels stuck, low B12 could be part of the problem

What Is Vitamin B12 and Why Is It Important

The process is quick and involves minimal discomfort

Key Findings from Preclinical Research Insights from Animal Studies While we always look to human trials for definitive answers, preclinical research offers a powerful window into how a compound works

In many cases, individuals with B12 deficiency may receive injections once a week for several weeks, followed by less frequent maintenance injections, such as once a month