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

2. Protecting Nerve Coatings and Brain Function
One of the primary functions of B12 is maintaining the health of the myelin sheath. Myelin is a protective layer that wraps around nerve fibers, ensuring the speed of nerve impulse transmission. The degradation of this layer due to vitamin deficiency leads to serious sensory and motor disorders that are sometimes irreversible.