5Problems Absorbing Vitamin B12
In some cases, high B12 levels might be associated with utilization problems in the body. This means the body is not able to process the nutrient properly, which leaves it to build up in the blood over time. Though vitamin B12 levels in the blood are high, you can still be at risk of this vitamin deficiency. For instance, this can be caused when the vitamin cannot bind to transport molecules properly. Typical symptoms of a deficiency of vitamin B12 include tingling feet and hands, fuzziness, weakness, and tiredness. [5]
