Vitamin B12 deficiency symptoms: Dr warns of 'yellow-blue colour blindness' – full facts

“Psychiatric symptoms (usually more prominent in advanced cases) may include depression, paranoia, delirium, confusion and dementia,” added Dr Tidy.

A vitamin B12 deficiency evidently can lead to troublesome side effects, so the sooner treatment is administered, the better.

As the vitamin is needed to create healthy red blood cells, the malfunction of such important cells is likely to lead to anaemia.

Signs of anaemia include fatigue, lethargy, faintness, heart palpitations and headaches.

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