Yes, vegans absolutely need vitamin B12 supplementation or fortified foods, as plant-based diets lack reliable natural sources of this essential nutrient.
Why Essential
B12, produced only by bacteria, supports red blood cell formation, nerve function, and DNA synthesis—deficiency risks anemia, fatigue, nerve damage, and cognitive issues within 1-3 years on unsupplemented vegan diets. Studies show 40-86% of vegans are deficient without intervention, higher than many meat-eaters.
Reliable Intake
Fortified plant milks/cereals (3mcg daily) or supplements (10mcg daily/2000mcg weekly) prevent issues; algae/seaweeds like spirulina fail as B12 analogs. Even vegetarians with dairy should monitor levels.
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