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Are you dealing with symptoms such as fatigue, muscle weakness and/or memory and mood problems? Vitamin B12 is an essential nutrient that is vital for brain function, nerve health, healthy red blood cell formation, and DNA creation. Active vitamin B12 (Holo-TC) represents the amount of vitamin B12 readily usable by the body. This measurement offers a more accurate view of vitamin B12 status, as total B12 levels may appear to be normal while the quantity that is usable by the body is still low. Use this self-test to check your active vitamin B12 levels quickly and easily from home.