Do vegans need B12 supplements?

Last reviewed: April 12, 2026

Summary

Yes. B12 is essential and must be supplemented or obtained from fortified foods on a vegan diet. This is not a flaw of veganism—B12 comes from bacteria, and modern food systems remove it from most sources.

Evidence Summary

The clear answer: Yes, vegans need B12 supplementation or reliable fortified foods. Why B12 matters: - Essential for nerve function and DNA synthesis - Deficiency causes irreversible neurological damage - Body stores can mask deficiency for years before symptoms appear Where B12 actually comes from: B12 is produced by bacteria found in soil and water. While some historical human populations may have obtained trace B12 from environmental contamination, the primary reliable dietary

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Disclaimer: This content is for informational purposes only and does not constitute medical or nutritional advice. Consult a qualified healthcare professional before making dietary changes.