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Vitamin B12 Supports Energy and Brain Function Vitamin B12 helps: Maintain healthy nerve cells Support red blood cell production Reduce tiredness caused by deficiency Support normal psychological function Low B12 levels may contribute to: Fatigue Poor concentration Brain fog Tingling sensations Muscle weakness Mouth ulcers Sore or red tongue The NHS guidance on vitamin B12 deficiency notes that deficiency can affect the nervous system and energy levels

It reduced homocysteine levels