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What is vitamin B12 deficiency anemia? Having vitamin B12 deficiency means that your body does not have enough of this vitamin. You need B12 to make red blood cells , which carry oxygen through your body. Not having enough B12 can lead to anemia, which means your body does not have enough red blood cells [...]

A vitamin B12 test measures the amount of vitamin B12 in the blood. The body needs this B vitamin to make blood cells and to maintain a healthy nervous system. Vitamin B12 is found in animal products such as meat, shellfish, milk, cheese, and eggs. Most people who eat animal products are not likely to [...]