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Vitamin B12 - Fact Sheet for Health Professionals

NIH Office of Dietary Supplements

National Institutes of Health

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Abstract

Fact sheet providing information about vitamin B12, including food sources, recommended intakes, signs of deficiency, and interactions with medications.

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Last checked: January 10, 2026

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Government Source

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By National Institutes of Health

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Last verified: January 10, 2026

Added: January 10, 2026