Vitamin B12 is one of the most important nutrients for brain and nerve health. Every cell in your nervous system needs it to work properly. When B12 levels drop, even if blood tests say “normal”, you can develop fatigue, brain fog, mood changes, memory issues, or serious nerve problems. Deficiency is common, especially in older adults, and catching it early can prevent or reverse many issues.

Vitamin B12 is needed by every cell in your body. It helps make red blood cells, keeps nerves healthy, supports DNA production, and powers energy inside cells. When B12 runs low, symptoms can show up almost anywhere—tiredness, brain fog, numbness, mood changes, or worse. Deficiency is common, often missed, and can cause serious problems if ignored.