Vitamin B12 deficiency is evident by report. But the B12 deficiency is usually not alone, it goes hand in hand with Vitamin D  deficiency. I recommend to kindly consult before embarking on treatment.

Thank you for your query. Your symptoms (low mood, poor concentration, tingling sensations, imbalance, and visual disturbance) can have multiple causes, including vitamin deficiencies such as B12, but also neurological or psychological conditions. It is not safe to advise treatment based only on symptoms or a partial report. Please consult a neurologist/physician with your complete reports for proper clinical evaluation and correlation before starting any medication, including B12 supplements. If you develop worsening imbalance, persistent vision issues, or new weakness, seek urgent medical attention.