Most people only associate low B12 with tiredness, anemia, or tingling nerves—but these are often late-stage signs. The most dangerous symptom can begin silently and affect your brain, memory, mood, and nervous system long before traditional symptoms show up. Vitamin B12 plays a critical role in producing and maintaining myelin, the protective coating around your nerves and spinal cord. When your B12 levels drop, this myelin sheath can slowly deteriorate. Over time, this can contribute to neurological changes, cognitive issues, balance problems, and other symptoms that are frequently mistaken for unrelated conditions. This video breaks down the #1 overlooked sign…

