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A serum B12 test (and ideally methylmalonic acid or homocysteine if your B12 is borderline) gives you a real answer rather than a guess

(19) Older research taken from the National Health and Nutrition Examination Surveys (NHANES) also linked low B12 levels to shorter sleep duration than normal (up to six hours a night)

It can help convert proteins, fats and carbohydrates into energy and is necessary for healthy skin and eyes

Vitamin B12, medically known as cobalamin, is one of the components of the vitamin B complex that plays an important role in cellular metabolism, as it acts as a cofactor in many biological pathways