Brain Fog or B12? The Hidden Nutrient Deficiency Mimicking Memory Loss

10. The Necessity of Periodic Testing and Prevention
Because the liver can store B12 for several years, symptoms of deficiency may not appear until long after the stores are exhausted. Therefore, an annual blood test to check the levels of this vitamin is essential. Prevention through a rich diet or timely supplementation is much simpler and cheaper than treating chronic nerve damage.