The Nerve Vitamin You Might Be Missing
Vitamin B12 deficiency affects 10–15% of the population, yet it often goes undiagnosed for years. In my practice in Zürich Seefeld, I regularly uncover B12 deficiency as the hidden cause behind chronic fatigue, concentration problems, and mood disorders. The challenge: symptoms develop so gradually that patients adapt to feeling unwell.
Symptoms
Chronic fatigue that sleep doesn’t resolve. Difficulty concentrating and memory problems (brain fog). Tingling and numbness in hands and feet. Depressive mood and irritability. Muscle weakness. Pale or slightly yellowish skin. Mouth ulcers and glossitis (smooth, red tongue). Dizziness and balance problems. In severe cases, irreversible nerve damage can occur.
Who Is at Risk?
Vegans and vegetarians: B12 is found almost exclusively in animal products. Without supplementation, deficiency is inevitable. Older adults: Stomach acid production decreases with age, reducing B12 absorption. PPI users: Acid-blocking medications significantly impair B12 absorption. Metformin users: This diabetes medication can cause B12 deficiency. People with gut disorders: Celiac disease, Crohn’s disease, and SIBO reduce absorption.
Diagnosis
Serum B12 alone can be misleading – levels may appear normal while functional deficiency exists. We recommend: serum B12, holotranscobalamin (active B12), and homocysteine (elevated when B12 is functionally low). This combination gives us a reliable picture.
Treatment
Oral supplementation (1,000–2,000 µg methylcobalamin daily) for mild deficiency. B12 injections for severe deficiency or absorption problems. Treating the underlying cause (gut health, medication review). Regular monitoring every 6–12 months.
Conclusion
B12 deficiency is common, easily missed, and very treatable. If you experience unexplained fatigue or neurological symptoms, schedule a comprehensive blood test at our practice in Zürich.
