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Vitamin B12 plays a crucial role in: Red blood cell production Brain and nerve function DNA synthesis Energy metabolism A deficiency can lead to symptoms like: Fatigue and weakness Poor concentration or memory Pins and needles Pale skin Low mood or irritability If left untreated, long-term deficiency can cause nerve damage and other health issues

With oral supplements, there can be sourcing and quality issues

For details see the Risks of B-12 section of our Vitamin B-12 Review, which includes our Top Picks for B-12

PMID: 8270456

Vitamin B12 is an important nutrient that helps keep the nervous system healthy , supports red blood cell production , and plays a role in DNA formation