Vitamin B12 is an essential nutrient that plays an important role in producing healthy red blood cells, supporting normal nerve function, and helping the body maintain DNA. Because the human body cannot make vitamin B12 on its own, it must come from food or supplements. Natural sources are found mainly in animal-based foods such as meat, fish, eggs, and dairy products. People who avoid these foods, including some vegetarians and vegans, may have a higher risk of developing low vitamin B12 levels unless they regularly consume fortified foods or take appropriate supplements.
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