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This Vitamin B12 Test is designed to measure the amount of vitamin B12 in the blood. Vitamin B12 or “Cobalamin” is essential in basic brain and nerve function, DNA synthesis, and red blood cell production. Those with low vitamin B12 are prone to megaloblastic anemia and symptoms such as weakness, pale skin, unexplained weight loss, and changes in mood or coordination. Foods such as fish, meat, eggs, and dairy products are rich in vitamin B12. To determine a vitamin B12 deficiency for sure, an accurate Vitamin B12 Test is recommended.