AI Insight
Vitamin B12, traditionally considered essential for red blood cell production, DNA repair, and nerve function, may have a more complex relationship with cancer than previously understood. While B12 deficiency can damage DNA and increase cancer risk, emerging research suggests that extremely high levels from long-term high-dose supplementation may be associated with certain cancers or worse outcomes in cancer patients. This challenges the conventional assumption that more B12 is always beneficial.
Why it matters
These findings have important implications for supplementation practices, particularly for individuals taking high-dose B12 supplements over extended periods. The research suggests a need for more nuanced clinical guidelines that balance the benefits of adequate B12 levels against potential risks of excessive supplementation, especially in cancer prevention and treatment contexts.
Vitamin B12 has long been seen as a health hero, helping the body make red blood cells, repair DNA, and keep nerves functioning properly. But scientists are discovering that the story may be more complicated than simply “more is better.” While too little B12 can damage DNA and raise cancer risk, some studies suggest that extremely high levels — especially from long-term high-dose supplements — may also be linked to certain cancers or poorer outcomes in cancer patients.
Source: Scientists are raising new questions about vitamin B12 and cancer